-The collet features small identification rings around its shank

-These rings correspond with the size of the collet: 0 rings = 1/8 In., 3 rings = 3/32 In., 2 rings = 1/16 In., 1 ring = 1/32 In.

-Collets are compatible with 225 flex-shaft attachment

-For use with all rotary tools except discontinued models 1, 2, and series 1 or earlier of discontinued models 260, 270 and 280