Each countersink combination has a HSS tapered drill bit, countersink and stop collar. In one drilling application the tapered bit and the countersink will create the correct pilot hole for a wood screw. The hex drive allows for a secure grip in drill chucks. Select the bit size to match drilling needs. Generally, it is helpful to have more than one size in order to match different screw sizes
Each countersink combination has a HSS tapered drill bit, countersink and stop collar. In one drilling application the tapered bit and the countersink will create the correct pilot hole for a wood screw. The hex drive allows for a secure grip in drill chucks. Select the bit size to match drilling needs. Generally, it is helpful to have more than one size in order to match different screw sizes