Alpha Onsite Plus 3.5-20.5mm Multi-Use Countersink CSAF3-20.5 

• Features
• Advanced 90° arc flute design produces smooth, chatter-free countersinks in steel & non-ferrous materials
• AlTiN Coated for extreme temperature resistance & long service life
• Smooth cutting edges for burr-free countersinking with perfect chip removal
• Optimised for hand-held use in cordless drills, achieving smooth & precise chamfering & countersinks
• ¼" Insert suits cordless drills