Er spring collet & chuck set – 10 pieces – er-40 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″. 10 piece set includes 8 collet – 1/8, 1/4, 3/8, 1/2, 5/8, 3/4, 7/8 & 1″ 1 collet chuck 1 wrench