# Twist drill bit set Irwin 4 mm, 10 pcs, model 10502520

**URL:** https://aio.lv/en/product--irwin-10502520--5042027
**Data updated:** 2026-03-07 15:12 (EET)
**Category:** Drill Bits
**Manufacturer:** Irwin
**Manufacturer code:** 10502520
**EAN:** 5706915000634
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 26.49 €
**Prices and availability valid until:** 2026-07-19 23:59
**Price without VAT (21%):** 21.89 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--irwin-10502520--5042027

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 14.07.2026 | free |
| Pickup points | 17.07.2026 | 1.99 EUR |
| Courier delivery to door | 17.07.2026 | 4.99 EUR |

## Summary description

Irwin twist drill bit set model 10502520 contains ten 4 mm drill bits designed for drilling tasks. These twist drill bits are intended for general drilling use with compatible drills. The set provides multiple identical bits for repetitive work, replacements, or toolkits, suitable for workshop, construction, and maintenance applications.

## Long description

Irwin twist drill bit set 4 mm, 10 pcs, model 10502520 contains ten identical HSS cobalt 4 mm twist drill bits intended for general and heavy-duty metal drilling. Each bit is manufactured to DIN 338 standards and incorporates 5% cobalt for improved heat and abrasion resistance. The 135° split point geometry reduces bit walking and enables faster penetration into metal surfaces, while a heavy-duty web construction increases strength and durability for repetitive workshop, construction and maintenance tasks.
Advantages
The set delivers consistent performance across multiple identical 4 mm bits, allowing rapid replacement during production or repair work. HSS cobalt composition (5% cobalt) enhances wear resistance and maintains hardness at elevated temperatures, making the bits better suited to drilling hard or heat-treated metals than standard high-speed steel. The 135° split point starts cutting immediately, reducing the need for center-punching in many applications, and the robust web reduces breakage risk during heavy-duty use.
Suitable for
 Drilling into steel and other hard metals, including heat-treated and abrasive alloys
 Workshop and maintenance drilling tasks requiring multiple spare bits
 Construction and mechanical assembly where repeatable hole quality is needed
 Portable and bench drilling operations with power drills and drill presses
Key specifications
 Drill bit type: Twist drill bits (HSS cobalt)
 Material composition: High-speed steel with 5% cobalt
 Diameter: 4 mm
 Quantity: 10 identical pieces
 Point angle and geometry: 135° split point for reduced walking
 Standards: Manufactured to DIN 338
 Construction: Heavy-duty web for increased strength
 Primary application: Metal drilling, including hardened and abrasive alloys
How to use
Select a compatible drill or drill press with appropriate chuck capacity and secure the workpiece. Mark the drilling location and, if required for precise alignment, use a center punch to create a small dimple. Install a 4 mm bit from the set into the drill chuck and tighten securely. Begin drilling at low speed to establish the hole, then increase speed as appropriate for the material and machine. Apply steady pressure and periodic coolant or cutting fluid when drilling hard or heat-treated metals to extend bit life and reduce heat buildup. Withdraw the bit occasionally to clear chips and avoid clogging.
Usage recommendations
For best results when drilling hardened or abrasive metals, use cutting fluid and moderate feed pressure, maintain correct drilling speed for 4 mm HSS cobalt bits, and replace bits from the set as they become worn to keep hole size and finish consistent.

## Specifications

| Feature | Value |
|---|---|
| Length | 75 mm |
| Proper use | Drill |
| Carrying case | Yes |
| Working length | 43 mm |
| Suitable for materials | Alloyed steel, Metal, Stainless steel |
| Drill bit diameter | 4 mm |
| Shank shape | Cylindrical shank |
| DIN compliance | 338 |
| Point angle | 135 ° |
| Drill bit material | High-Speed Steel (HSS) |
| Number of drill bits | 10 pc(s) |
| Drill bit type | Twist drill bit |

## FAQ

### How much does the Irwin twist drill bits 4 mm, 10 pcs 10502520 cost, and is it available for purchase?

The price is 26.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 20 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 14.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All Irwin products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Irwin service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/5042027/59318023_large.webp