KWB 512004 Drill Bit Single 4 mm Hex

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

Key specifications

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.

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.