Drill bit set Proline 77990 — 19 pieces, metal and wood drilling sizes

Proline 77990 — 19-piece drill bit set provides a selection of commonly used diameters for drilling in wood and metal. The set is intended for general workshop, DIY and repair tasks where reliable, versatile drill bits are required. Each bit is fully ground and coated with titanium nitride to increase lifetime and improve hole finish. The geometry includes a 135° point angle with chamfering adjustment for accurate centring and reduced walking on workpieces.

Advantages

The drill bits are manufactured by grinding for consistent diameter accuracy and straightness. A titanium nitride coating extends service life, reduces friction and improves chip evacuation and hole surface quality. The 135° point angle with chamfering adjustment allows faster penetration in metal while keeping cleaner hole edges in wood. The set of 19 sizes covers a wide range of common drilling diameters so you can complete a variety of mounting, fabrication and repair jobs without changing to specialty bits.

Suitable for

• Drilling holes in metal sheets, profiles and pipes
• Drilling in soft and hard wood, plywood and chipboard
• General workshop maintenance and repair tasks
• DIY projects and home installations where multiple diameters are needed

Key specifications

• Number of pieces: 19
• Point angle: 135° with chamfering adjustment
• Manufacturing method: fully ground
• Coating: titanium nitride (TiN)
• Suitable materials: metals and wood

How to use

Select the drill bit size appropriate to the desired hole diameter and material. Secure the workpiece and clamp if necessary to prevent rotation or movement. Fit the bit into the drill chuck and tighten securely. For metal drilling, use appropriate cutting speed and, when required, a cutting fluid to reduce heat. Start drilling at low speed to establish the hole, then increase speed as appropriate for the material. Maintain steady pressure and withdraw periodically to clear chips and avoid overheating. After use, wipe bits clean and store them in their case to protect the coating.

Usage recommendations

Use slower speeds and light cutting fluid for hard metals, and higher speeds for wood. Replace worn bits to maintain hole quality; the titanium nitride coating prolongs life but does not eliminate wear. Match drill speed and feed to the material to get optimal results.