AccusizeTools - ER-40 SET 23pcs/set 1/8"-1" in Fitted Strong Box, 0223-0935 23 Pcs/Set ER40 Collet Set 1/8" to 1", 0.0005" in Fitted Strong Box, #0223-0935 collet sizes: 1/8", 3/16", 7/32", 1/4", 5/16", 11/32", 3/8", 13/32", 7/16", 1/2", 17/32", 9/16", 5/8", 21/32", 11/16", 3/4", 25/32", 13/16", 27/32", 7/8", 15/16", 32/31", and 1" In fitted strong case Concentricity: 0.0005" Design affords highest gripping power True double angle fo better accuracy 16 jaws for powerful gripping and parallel clamping