Er spring collet & chuck set – 14 pieces – er-32 high precision collet chuck system suitable for all milling and drliling applications. Unique self-releasing system wide holding range with fitted case accuracy to .0005″. 14 piece set includes 12 collet – 1/16, 3/32, 1/8, 3/16, 1/4, 5/16, 3/8/ 7/16, 1/2, 9/16, 5/8 & 13/16″ 1 collet chuck 1 wrench