Drill bit Proline 77175 — 17.5 mm diameter, 191 mm length, 1 pc

Proline 77175 metal drill bit with a 17.5 mm cutting diameter and 191 mm overall length is engineered for precise medium-diameter holes in metalworking, repair and installation tasks. The bit features a straight shank compatible with handheld drills and drill presses. Manufactured from high-quality refined HSS and produced entirely by grinding, this drill delivers high concentricity and straightness of holes for consistent results when a reliable 17.5 mm opening is required.

Advantages

The Proline 77175 uses a 135° point angle with chamfering adjustment to enable fast penetration and reduced need for centre punching. Being fully ground rather than cylindrical or precision ground increases drilling efficiency and accuracy. Made from refined HSS, the bit offers increased abrasion resistance, improved resilience and enhanced torsional strength for longer service life under typical metal drilling conditions. The product is supplied in a protective plastic rectangular tube suitable for safe storage and transport.

Suitable for

• Drilling holes in steel sheets, plates and structural metal components
• Fabrication and workshop tasks requiring a precise 17.5 mm hole
• Repair and installation work with handheld drills or bench drill presses
• Creating holes for fasteners, bushings or pipe fittings in metal

Key specifications

• Cutting diameter: 17.5 mm
• Overall length: 191 mm
• Point angle: 135° with chamfering adjustment
• Shank type: straight shank for handheld drills and drill presses
• Material: high-speed steel (refined HSS), fully ground
• Characteristics: increased abrasion resistance, improved resilience and torsional strength
• Packing: single piece in a protective plastic rectangular tube

How to use

Secure the workpiece and mark the drilling position accurately. Select an appropriate drill speed for the metal being drilled and clamp the Proline 77175 bit firmly in the chuck of a handheld drill or drill press. If necessary, use a centre punch to define the start point; the 135° point angle with chamfering adjustment reduces the need for heavy centre punching. Apply steady feed pressure, allow the bit to cut without excessive force, and withdraw periodically to clear chips. Use cutting fluid for steel and harder alloys to reduce heat and extend tool life.

Usage recommendations

For best results when drilling metals, use appropriate cutting fluid, moderate spindle speeds and steady feed. Inspect the bit for wear before use and replace if cutting performance or hole quality degrades. Store the bit in its protective plastic tube to prevent damage and maintain straightness.