Countersinking

Countersinks
Available in a range of sizes and versions

603060 90° Countersink
6.3mm to 31mm Diameters

603070 Drillsink
A very effective combination drill and countersink
12.4mm to 25mm (M6 to M12)

Versadrive Countersinks & Drillsinks work well on Impact up to 16.5mm diameter.

Larger sizes than this should be used in a pistol drill

There are also a range of larger countersink and multisink options in from 40 to 80mm diameter