Drill bit Proline 79125K, metal, Ø 12.5 mm, length 151 mm, 1 pc

Proline 79125K metal drill bit has a 12.5 mm diameter and an overall length of 151 mm. Manufactured from refined high-speed steel (HSS) with ground cutting edges and a 135° point angle with chamfering adjustment, this straight-shank drill is designed for drilling metal and other hard materials. The single-piece packaging and robust construction make it suitable for workshop, maintenance and construction tasks where a single large-diameter hole is required and compatible with standard drill chucks.

Advantages

The refined HSS material and precisely ground edges provide consistent cutting performance and extended tool life when drilling metals. The 135° point angle with chamfering adjustment supports quick entry and reduces the need for extensive centre punching, improving drilling accuracy and saving time. The straight shank design ensures secure clamping in most drill chucks and minimizes runout for cleaner holes.

Suitable for

• Drilling holes in ferrous and non-ferrous metals
• Workshop and maintenance repairs
• Construction tasks requiring a single large-diameter hole
• Use with corded and cordless drills with compatible chucks

Key specifications

• Diameter: 12.5 mm
• Overall length: 151 mm
• Material: refined high-speed steel (HSS)
• Point angle: 135° with chamfering adjustment
• Cutting: ground edges for improved accuracy
• Shank type: straight shank
• Package quantity: 1 piece

How to use

Secure the drill bit in a compatible drill chuck, ensuring the shank is fully seated and the chuck is tightened to prevent slipping. Mark the drilling position and, if necessary, use a centre punch to create a shallow dimple for improved accuracy. Start drilling at low speed to establish the hole, apply steady pressure without forcing the bit, and increase speed as appropriate for the material being drilled. Use cutting fluid or oil when working with metals to reduce heat, improve lubrication and extend bit life. After completing the hole, withdraw the bit slowly while the drill is still turning to clear chips safely.

Usage recommendations

For best results when drilling metal, use cutting fluid, maintain moderate drilling speed suited to the material thickness, and avoid excessive side loads. Replace the bit if wear or chipping of cutting edges is visible to preserve hole quality and reduce the risk of breakage.