3pcs Round Shank Titanium Coated Step Drill Bit Set 3/16-1/2 1/8-1/2 1/4-3/4 Step Drill

Description: 3pcs Round Shank Quick-change Titanium Coated Step Drill Bit Set 3/16-1/2 1/8-1/2 1/4-3/4 Step Drill Specification: Material:High speed steel 4241 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) Titanium Step Drill More Details: