12 Pcs High Precision Imperial R8 Collet Set 3mm to 22 mm for Milling Lathe Feature: Covering 12 sizes from 1/8 to 7/8, to diverse tool shanks without frequent changes Package Includes: 12 Pcs R8 Collet Set?1/8" 3/16" 1/4" 5/16" 3/8" 7/16" 1/2" 9/16" 5/8" 11/16" 3/4" 7/8" ?3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18.mm, 20mm, 22mm)