There are 4 different sized collets available to accommodate different accessory shank sizes from 1/8 inch down to 1/32 inch. It is essential to use the correct sized collet for each accessory. The collets are marked with corresponding shank size: no rings – 1/8 inch (480), 1 ring – 1/32 inch (483), 2 rings – 1/16 inch (482), 3 rings – 3/32 inch (481).