Hex Titanium Step Cone Drill Bit Hole Cutter 4-22MM HSS Size: 4-22 mm6,8,10,12,14,16,18,20, 22mm :6mm(dia),25mm(L) :75mm(L) Material:High speed steel Color:As shown The ladder of unique structure,a bit can open a of specifications of . Do not need to use center punch,compared with twist drill is not easy to be broken. Deburring,chamfering,elliptic hole enlargement,twist drill,the function of unable, 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. Package include 1x Hex Titanium Step Drill Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.