|Size: :||4-22 mm（6,8,10,12,14,16,18,20 22）mm|
|Material: :||High speed steel 4241|
|Package include :||1XHex Titanium Step Drill|
-The ladder of its unique structure, a bit can open a variety of specifications of aperture.
-Do not need to use center punch, compared with the ordinary twist drill is not easy to be broken.
-Deburring, chamfering, elliptic hole enlargement, twist drill, the function of them was unable, but it is possible.
-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.
Size: 4-22 mm（6,8,10,12,14,16,18,20 22）mm
Please allow 1-3mm measurement error.
Material: High Speed Steel 4241
1 x Hex Titanium Step Drill