DOPOW Wall Drill Bit Hole Saw Set 3.74in95mm with SDS PLUS Shaft + Hole Saw + Core Drill Bit *Made of high quality alloy welding, made of chrome vanadium steel, high density, strong hardness, good toughness and strong bending resistance; *Wide range of applications: for the opening of various brick-concrete structures *Easy to install: with a wrench and built-in screws to reduce the problem of falling off the drill during work. *Complete specifications:30mm-160mm1.18In-6.3In)Series completeaccept non-standard customization *Free exchange for 30 days