Drill bit set Proxxon 28 255, 2 pieces, length 44 mm

Proxxon 28 255 drill bit set contains two precision drill bits, each with a working length of 44 mm and a shaft diameter of 2.35 mm. Designed for fine drilling tasks, these bits are intended for use with compatible rotary tools and small drills when working with (semi)precious stones and similar hard materials. The compact set provides two identical bits for repeatable results and easy replacement during longer jobs.

Advantages

The set provides two identical high-precision bits that ensure consistent hole dimensions and reliable performance in stone and similar hard materials. With a 44 mm length and slim 2.35 mm shaft, the bits are suitable for detailed work and allow good access in confined spaces. Supplied as a pair, the set reduces downtime by providing a spare bit for continuous use.

Suitable for

• Drilling holes in (semi)precious stones and gemstones
• Fine jewelry and small-scale lapidary work
• Precision model making and detailed craft projects involving stone

Key specifications

• Quantity: 2 pieces
• Total length (per bit): 44 mm
• Shaft diameter: 2.35 mm
• Intended material: Stone and similar hard non-metallic materials
• Tool compatibility: Small drills and rotary tools with suitable 2.35 mm collet or chuck

How to use

Secure the appropriate drill in a compatible rotary tool or drill that accepts a 2.35 mm shaft. Mount the drill bit firmly in the collet or chuck to avoid slippage. For drilling (semi)precious stones, use gentle, consistent pressure and keep the bit perpendicular to the work surface. Use a slow to moderate rotational speed and apply intermittent drilling with pauses to avoid overheating. Where appropriate, use a coolant or water to reduce heat and remove dust from the drilling area. Replace the bit with the spare from the set when wear affects performance.

Usage recommendations

Use appropriate safety equipment including eye protection and a dust mask when drilling stone. Work on a stable fixture or jig to minimise vibration and ensure accurate holes. Test drilling parameters on a scrap piece before working on valuable stones, and keep the bit cool with water or a suitable lubricant to prolong life.