# Diamond drill bit Proxxon 28844 — 20 mm diameter, single piece

**URL:** https://aio.lv/en/product--proxxon-28-844--1443371
**Data updated:** 2026-03-07 10:59 (EET)
**Category:** Power Tools Accessories
**Manufacturer:** Proxxon
**Manufacturer code:** 28 844
**EAN:** 4006274288447
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 18.49 €
**Prices and availability valid until:** 2026-07-16 23:59
**Price without VAT (21%):** 15.28 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--proxxon-28-844--1443371

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 07.07.2026 | free |
| Pickup points | 10.07.2026 | 1.99 EUR |
| Courier delivery to door | 10.07.2026 | 4.99 EUR |

## Summary description

Proxxon 28844 is a single-piece diamond drill bit with a 20 mm diameter designed for drilling applications. As a diamond-tipped drill bit, it is intended for precise cutting and drilling of hard materials where a durable, wear-resistant tip is required. Suitable for use with compatible drills for tasks that need accurate, clean holes.

## Long description

Proxxon 28844 — 20 mm diameter single-piece diamond drill bit is designed for precise drilling and cutting of hard and brittle materials. The diamond-coated cutting edge provides wear resistance and long service life for tasks that require clean, accurate holes. The bit includes a mandrel with a 3/32" (2.35 mm) shank and a 20 mm wheel, and cooling holes reduce heat build-up for burr-free results without burn marks.
Advantages
The single-piece construction ensures stability and reduced vibration during operation, improving hole accuracy. Diamond abrasive at the working end delivers efficient material removal on glass, ceramics, porcelain and other hard substrates. Integrated cooling holes lower friction and temperature, which minimizes chipping and prevents thermal damage to sensitive workpieces. The included mandrel with a 2.35 mm shank makes the bit compatible with a wide range of handheld and bench drills fitted for that shank size.
Suitable for
 Drilling clean holes in glass and ceramics
 Cutting and shaping porcelain and tiles
 Working on fiberglass and plastics without excessive melting
 Precision tasks on non-ferrous metals and steel where small-diameter holes are needed
 Deburring and grinding edges of brittle materials
Key specifications
 Cutting diameter: 20 mm
 Tool type: single-piece diamond drill bit
 Shank size: 3/32" (2.35 mm) mandrel included
 Abrasive: diamond-coated working edge
 Cooling: holes in the bit design to reduce heating
 Typical materials: glass, porcelain, ceramics, fiberglass, plastics, non-ferrous metals, steel
How to use
Secure the mandrel with its 2.35 mm shank in the drill chuck and clamp the workpiece to prevent movement. Begin drilling at low to moderate speed, using steady pressure and keeping the drill perpendicular to the surface. For brittle materials such as glass and ceramics, use water or another coolant to further reduce heat and flush debris from the cutting area. Avoid excessive force; allow the diamond abrasive to cut progressively. After completing the hole, slow the drill before withdrawing the bit to prevent chipping at the exit point.
Usage recommendations
Use consistent cooling (water or a commercial coolant) when working on glass, porcelain or ceramic tiles. Start with a pilot indentation or use masking tape to help prevent slipping. Wear appropriate personal protective equipment such as safety glasses and gloves, and follow the drill manufacturer's instructions for maximum operating speed for a 2.35 mm shank accessory.

## Specifications

| Feature | Value |
|---|---|
| Product colour | Stainless steel |
| Proper use | Drill |
| Suitable for materials | Ceramic, Glass, Plastic |
| Drill bit diameter | 20 mm |
| Shank diameter | 2.35 mm |
| Shank shape | Cylindrical shank |
| Number of drill bits | 1 pc(s) |
| Drill bit type | Diamond drill bit |

## FAQ

### How much does the Diamond drill bit Proxxon 28844 — 20 mm cost, and is it available for purchase?

The price is 18.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 25 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 07.07.2026 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 Proxxon 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 Proxxon 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/1443371/57953323_large.webp