Nascco High Speed Steel Hss4241 Spiral Groove Step Drill Bit 6-60mm for use in hardness under 25° artifacts

Description

Features: 100% brand new and high quality Unique ladder structure , it can open multiple Aperture it can not easily be broken. It can deburr, chamfer and open hole, but ordinary twist drill can't Little rock, it can carve out a nice aperture without firstly using a center punch Tool using: pistol drill, bench drill. Water to make ti cool while working, it can effectively extend the service life. Recommended drilling speed 250--400 rpm Suit for use in hardness under 25° artifacts,The plate thickness under 5mm Specifications: 6-60mm(12 steps:6,10,15,20,25,30,35,40,45,50,55,60mm) Shank Diameter: 13mm Material: HSS 4241 Package Included: 1pcs HSS 4241 Spiral groove step drill