The Faithfull pin chuck is a useful accessory for holding drills too small to be held by standard capacity drill chucks. Supplied with three collets of the following sizes 1 x 0 - 0.75mm (0 - 1/32in). 1 x 0.75 - 1.5mm (1/32 - 1/16in). 1 x 1.5 - 2.5mm (1/16 - 3/32in).