Package included: 16pcs 3, 4, 5, 6, 7, 8, 9, 10, 11,12, 13, 14, 15, 16,1/2, 1/8 Product name: Sharpener chuck Material: 65Mn Hardness: HRC55-60 Thread length: 29mm Overall length: 122mm Polished rod diameter: 20mm Thread size: M20