Kit consisting of a special collet nut and four collets for use with a variety of Dremel tools, attachments and handpieces. Allows you to quickly change collets to accept bits with shanks of 1/32" to 1/8". Kit contains (1) each 1/8" Collet, 3/32" Collet, 1/16" Collet, 1/32" Collet and Collet Nut.