Drill Bit Single KWB 512004 4 mm Hexagonal

The KWB 512004 4 mm hexagonal drill bit is made of HSS-M2 for drilling hardwoods, softwoods and Bangkirai. It combines a drill, adjustable counterbore and countersink in one tool and has a 1/4" hexagon shank (ISO 1173, E 6.3) for quick, secure fitting in drills and drivers. A ball-bearing counterbore prevents the counterbore from rotating when it contacts the workpiece, reducing the risk of marking the wood and ensuring consistent bore and countersink depth for decking and garden furniture assembly.

Advantages

The solid HSS-M2 construction provides wear resistance and maintains sharpness when pre-drilling hardwood. The integrated adjustable counterbore and countersink deliver precise, repeatable recesses for screw heads. The ball-bearing support stops the counterbore from turning against the wood surface, preventing damage and ensuring a neat finish. The 1/4" hexagon shank enables fast bit changes and secure retention in hex chucks.

Suitable for

• Pre-drilling screw holes in decking boards and garden furniture made of Bangkirai and other hardwoods
• Creating pilot holes in softwood and hardwood prior to fastening
• Applications requiring a consistent countersink and bore depth for recessed screw heads

Key specifications

• Brand: KWB
• Model / MPN: 512004
• Diameter: 4 mm
• Material: HSS-M2
• Shank: 1/4" hexagon, ISO 1173 (E 6.3)
• Features: adjustable counterbore and countersink, ball-bearing counterbore stop
• Packaging: single bit in blister

How to use

Fit the 1/4" hex shank into a compatible drill or driver and tighten the chuck. Adjust the counterbore to the required recess diameter and set the countersink depth as needed. Position the bit perpendicular to the workpiece and drill at a steady, moderate speed, applying controlled pressure. The ball-bearing counterbore will stop rotating when it contacts the surface to avoid marking the wood; continue drilling until the pilot hole and countersink reach the set depth.

Usage recommendations

Use the bit at moderate speed when working with hardwoods such as Bangkirai and apply light, steady pressure. Inspect the bit for wear before use and replace if the cutting edges are dull. For repetitive work, check the counterbore and countersink settings regularly to maintain consistent recess depth.