Mainly used in all kinds of drilling and milling machines. Item Type: R8-ER40 Collet Set. 1 R8-ER40 Collet Chuck Holder. Collet Size: ER40-1/2, ER40-1/4, ER40-3/4, ER40-1/8, ER40-3/8, ER40-5/8, ER40-7/8, ER40-3/16, ER40-5/16, ER40-7/16, ER40-9/16, ER40-13/16, ER40-15/16, ER40-11/16, ER40-1".
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