3-13mm HSS Titanium Coated Step Drill 1/4 Inch Hex Shank Step Drill Bit

 

Material: HSS

Surface treatment: titanium

Shank :1/4 Hexagonal

Size: 3-13mm (11 steps: 3,4,5,6,7,8,9,10,11,12,13mm)

Tools: pistol drill, bench drill.

Shank: 7mm(dia),30mm(L)

Total: 77mm(L)

 

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.

5. High-speed steel, used in hardness under 25 ° workpiece, the plate thickness under 5 mm. such as carbon steel plate, sheet iron, insulation boards, wood. Cannot be used for stainless steel.

 

1x 3-13mm Step drill