PET-U 29Pcs R8 Collet Set 1/32 inch - 1 inch Mill Collets Set Steel Mill Chuck Holder Fit for Mill Machine

steel Size of R8 collet set: 1/32 inch - 1 inch, threaded internally of R8 collet set: 7/16 inch - 20. Mill chuck holder kit is made of steel, which has good rigidity, more durability and long service life. Various models meet your needs. Mill collets set clamping force, strong versatility. Mill chuck holder hole grinding, smooth surface, small resistance. R8 collet spring collet set after quenching and grinding, high hardness, high precision, small runout tolerance.