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Stepped Drill Bits

Show me the range of stepped drill bits needed for pre-drilling pilot holes in aluminium and steel for threaded studs

Show me the range of stepped drill bits needed for pre-drilling pilot holes in aluminium and steel for threaded studs
Stepped drill bit TX-BT 31-95 PFP PFP removal drill bits for predrilling accurate holes and removing cementitious and intumescent passive fire protection coatings from steel
Stepped drill bit TS-BT 31-95 PFP PFP removal drill bits for predrilling accurate holes and removing cementitious and intumescent passive fire protection coatings from steel