Our packaging will always tell you what size shank the accessory is (show an example of that). The collets are marked with ring. The 480 does not have any rings around the stem, the 481 (3/32) has 3 rings, the 482 (1/16) has 2 rings, and the 483 (1/32) has 1 ring. Note: after you have inserted and tightened down on the shank of any accessory, always check to make sure the accessory is tight in the tool by giving it a little tug before you turn your tool on. If the collet and collet nut you have chosen are not securing that accessory, you may need a different collet.