Collets

Collets for the compact router, in 6, 6.35 and 8 mm. The collet is what actually grips the cutter shank, and it is sized to it — an 8 mm cutter in a 6 mm collet is not a thing you can force. Collets wear and lose grip; a cutter that creeps down in use during a cut is usually a tired collet rather than a loose nut.