Drill bit Proline 77155 — metal, Ø 15.5 mm, length 178 mm, 1 pc

Single Proline 77155 drill bit for metal, diameter 15.5 mm and overall length 178 mm, designed for drilling holes in various metal workpieces. The bit features a straight shank that fits standard chucks and drills used in maintenance, fabrication and on-site metalworking. Manufactured by precision grinding from high‑quality refined high-speed steel (HSS), it provides straight, accurate holes and is supplied as a single piece in a protective plastic tube for safe storage and handling.

Advantages

The 135° point angle with chamfering adjustment enables quick penetration and reduces the need for extensive centre punching. Fully ground construction delivers high precision and excellent straightness of openings, outperforming cylindrical or conventionally ground drills in cutting efficiency. Made from refined HSS, the bit offers increased resistance to abrasion, improved resilience and elevated torsional strength suitable for repeated use in metalworking environments.

Suitable for

• Drilling mid‑size holes in steel and other common metals
• Workshop maintenance and equipment repair
• Fabrication tasks where a 15.5 mm hole is required
• On‑site metalworking and construction jobs with portable drills

Key specifications

• Diameter: 15.5 mm
• Overall length: 178 mm
• Point angle: 135° with chamfering adjustment
• Material: refined high‑speed steel (HSS), fully ground
• Shank type: straight shank compatible with standard chucks
• Packaging: single piece in a plastic rectangular tube

How to use

Select an appropriate drill with a compatible chuck and secure the Proline 15.5 mm bit firmly in the chuck. Mark and, if necessary, centre‑punch the drilling point to improve accuracy. Use steady feed and moderate cutting speed appropriate for the metal being drilled; apply cutting fluid or lubricant where recommended to reduce heat and wear. Withdraw the bit occasionally to clear chips and maintain cutting efficiency. After use, clean the drill and store it in its protective tube to prevent damage.

Usage recommendations

For best results when drilling hardened or thicker metal sections, use cutting fluid, maintain controlled drilling speed and avoid excessive axial force. Inspect the drill periodically for wear and replace when cutting efficiency or precision decreases.