# Drill bit Proline 78055K — metal drill bit Ø 5.5 mm, length 93 mm, 1 pc

**URL:** https://aio.lv/en/product--proline-78055k--11720588
**Data updated:** 2026-03-08 11:23 (EET)
**Category:** Drill Bits
**Manufacturer:** Proline
**Manufacturer code:** 78055K
**EAN:** 5903755154019
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 5.99 €
**Prices and availability valid until:** 2026-07-15 23:59
**Price without VAT (21%):** 4.95 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--proline-78055k--11720588

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 06.07.2026 | free |
| Pickup points | 09.07.2026 | 1.99 EUR |
| Courier delivery to door | 09.07.2026 | 4.99 EUR |

## Summary description

Proline 78055K is a single metal drill bit with a diameter of 5.5 mm and overall length of 93 mm. Designed for drilling metal, it is supplied as one piece for use with handheld drills and drill presses. Suitable for general metalworking tasks such as creating holes in steel, aluminium and other ferrous and non-ferrous metals.

## Long description

Proline 78055K is a single metal drill bit with a diameter of 5.5 mm and an overall length of 93 mm, intended for use with handheld drills and drill presses. Made from high-speed steel with 5% cobalt (HSS-Co), this drill bit is designed for drilling a wide range of metals including steel, aluminium and other ferrous and non-ferrous metals. The 135° point angle with chamfering adjustment supports fast, precise starts and reduces walking when marking and positioning the drill.
Advantages
The HSS with 5% cobalt construction provides elevated heat resistance and wear performance compared with standard HSS, allowing prolonged cutting at higher temperatures. The 135° point angle and chamfering adjustment enable quicker penetration and improved centring on metal surfaces. Manufactured entirely by grinding, the flute geometry and cutting edges offer high accuracy and straightness of holes. Supplied as a single piece in a blister pack, the drill bit is ready for immediate use in professional and hobby metalworking tasks.
Suitable for
 Drilling holes in steel and stainless steel
 Drilling aluminium and other non-ferrous metals
 Use with handheld electric drills and drill presses
 General metalworking and fabrication tasks
Key specifications
 Diameter: 5.5 mm
 Overall length: 93 mm
 Material: HSS with 5% cobalt (HSS-Co)
 Point angle: 135° with chamfering adjustment
 Manufacturing: fully ground for accuracy and straightness
 Suitable for high-alloy, titanium, acid-resistant and creep-resisting steels, cast iron and other difficult-to-machine materials
 Packaging: single piece in blister pack
How to use
Secure the drill bit in the drill chuck, ensuring it is tightened concentrically. Use appropriate cutting speed and feed for the material being drilled; lower speeds are generally recommended for harder alloys and stainless steels. Apply cutting fluid or coolant when drilling heat-sensitive or high-alloy materials to extend tool life and improve chip evacuation. Begin drilling with steady pressure and allow the tool to do the cutting; avoid excessive force that can cause overheating or premature wear.
Usage recommendations
For best results, select speeds and feed rates suitable for HSS-Co tools and the specific metal type. Use cutting fluid for stainless, high-alloy or titanium materials, and periodically withdraw the drill to clear chips when drilling deep holes. Store the drill bit in its blister pack to protect the ground cutting edges until use.

## Specifications

| Feature | Value |
|---|---|
| Length | 93 mm |
| Metal drill bits diameter | 5.5 |
| Number of drill bits | 1 pc(s) |

## FAQ

### How much does the Drill bit Proline 78055K Ø5.5 mm, 93 mm cost, and is it available for purchase?

The price is 5.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 200 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 06.07.2026 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 Proline 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 Proline 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/11720588/67193497_large.webp