Name: Centering drill
Material: HSS-CO with diamonds
Hardness: HRC62-64 degrees
Purpose: Punch fixed-point holes, orifice chamfering, point holes and chamfering are completed at once.
Before drilling, use a centering drill to drill an initial hole with a depth of 1-2 times the diameter to ensure ordinary drilling.
The accuracy of the hole processing of the head does not reserve chamfering for tapping, which is convenient for tapping.
Processable: stainless steel below HRC38 degrees, mold steel, spring steel, 45 steel, A3 steel, cast iron parts, copper and aluminum, etc.