3支裝階梯鉆Category:CuttingTools Drilling MaintenanceDrills TaperDrills Sheet TubeDrills3PieceHSSSteppedConeDrillSet3piecesteppedconedrillsetmanufacturedfromhighspeedsteel,resultinginlongtoollifeandextradurability.Eachstepproducesspecificsized,parallelholes,withthemaximummaterialthicknessbeingdeterminedbythelengthofstep.Thedrillsarecapableofproducingorenlargingholesinsheetmetalswithouttheneedforcentrepunchorpilotholes,andaredesignedforusewithpowertoolsorpedestaldrillingmachinesforanextensiverangeofindustrialapplications.Sizes:4mm-12mm(8step),4mm-20mm(8step) 4mm-30mm(13step).