hex hss spiral grooved step drill set ()<br />drop forged｣ｬ heat treated｣ｬ high speed steel｣ｬ fully polish<br />take the guessing out of drilling by supplying the proper depth for you<br /><br />specifications:<br />color: golden (as picture shown)<br />material: high speed steel<br />quantity: 1pc<br />#1: 4mm to 12mm 9 steps (4mm｣ｬ 5mm｣ｬ6mm｣ｬ7mm｣ｬ8mm｣ｬ 9mm｣ｬ10mm｣ｬ11mm｣ｬ12mm)<br />#2: 4mm to 20mm 9 steps (4mm｣ｬ 6mm｣ｬ 8mm｣ｬ 10mm｣ｬ 12mm｣ｬ 14mm｣ｬ 16mm｣ｬ18mm｣ｬ20mm)<br />#3: 4mm to 32mm 15steps (4mm｣ｬ 6mm｣ｬ 8mm｣ｬ 10mm｣ｬ 12mm｣ｬ 14mm｣ｬ 16mm｣ｬ 18mm｣ｬ 20mm｣ｬ 22mm｣ｬ 24mm｣ｬ26mm｣ｬ28mm｣ｬ30mm｣ｬ32mm)<br />length:<br />4mm to 12mm 9 steps length: 7cm<br />4mm to 20mm 9 steps length: 7.3cm<br />4mm to 32mm 15 steps length: 10cm<br /><br />package includes:<br />1 x step drill bit<br />