3pcs Titanium Coated Step Drill Bit Quick Change 1/4 Inch Hex Shank

Description: 3pcs Titanium Coated Step Drill Bit Set Quick-change 1/4 Inch Hex Shank Specification: Shank:6mm(dia),25mm(L),1/4" Material:High speed steel 4241 Allow 1-3mm measurement error. 3/16-1/2'' (6 steps) 3/16''(4.76mm) 1/4''(6.35mm) 5/16''(7.94mm),3/8''(10.35mm) 7/16''(11.11mm) 1/2''(12.7mm) 1/4-3/4'' (9 steps) 1/4''(6.35mm) 5/16''(7.94mm) 3/8''(10.35mm) 7/16''(11.11mm) 1/2''(12.7mm),9/16''(14.28mm) 5/8''(15.88mm) 11/16''(17.46mm) 3/4''(19.05mm) 1/8-1/2'' (13steps) 1/8''(3.18mm) 5/32''(3.97mm) 3/16''(4.76mm) 7/32'',(5.56mm) 1/4''(6.35mm),9/32''(7.14mm) 5/16''(7.94mm) 11/32''(8.73mm) 3/8''(9.53mm) 13/32''(10.32mm),7/16''(11.11mm),15/32''(11.91mm),1/2''(12.7m) Features: 1, The ladder of its unique structure, a bit can open a variety of specifications of aperture. 2, Do not need to use center punch, compared with the ordinary twist drill is not easy to be broken. 3, Deburring, chamfering, elliptic hole enlargement, twist drill, the function of them was unable,but it is possible. 4, The use of tools: drill, bench drill.Work while water cooling, can effectively extend the service life of drill bit, recommend drilling rate of 250-250 RPM. Package included: 1x Set (3pcs)Hex Titanium Step Drill