With the Metabo 625021000 countersink, you combine pre-drilling and countersinking into one single, efficient step. Simply slide the accessory onto a 4 mm wood twist drill bit and secure it firmly at the required position with the integrated hex screw. Five sharp cutting edges made of durable hss steel ensure clean, splinter-free countersinking, allowing screw heads to sit flush or neatly recessed into timber surfaces. When you need consistent hole depth across repetitive drilling jobs, simply invert the countersink on your drill bit to use it as a reliable depth stop collar.