About this itemDRILL ACCURATE HOLES-- Made of high-quality hard alloy for good performance, it can make clean and accurate holes for you. which works as a set of glass drills which are very easy to useFAST DRILLING SPEED-- The cutting resistance is small with stable function, and the drilling speed is fast, also the boundary is not damagedHAND DRILL ACCESSORY-- Neat opening, smooth, no folds, no tremor, such hand drill accessory can work for easy chippingREDUCE DRILL BREAKAGE-- Professional glass and tile drills are for smooth, accurate drilling of tiles, marble, porcelain, mirrors and glass. Triangular design reduces drill breakage. And the drill has a carbide tip to extend drill lifeWIDELY APPLICABLE-- Widely applicable, it can be installed in ordinary electric hand drills, bench drills, impact drills, etc. And machine drill clamp range is 10mm and aboveSpecification:Item Type: Drill bitMaterial: 45 steel inlaid alloy bladeSurface Treatment: Titanium platingScope of Application: Glass, ceramicsSize: Tool Diameter:Approx. 4mm / 0.16inApprox. 5mm / 0.2inApprox. 6mm / 0.24inApprox. 8mm / 0.31inApprox. 10mm / 0.39inApprox. 12mm / 0.47inLength:Approx. 60mm / 2.91inApprox.62mm / 2.97inApprox.72mm / 2.92inApprox.72mm / 3.02inApprox. 81mm / 3.24inApprox. 85mm / 3.32inPackage List: 6 x Drill BitsNote:1. When cutting or drilling, remember to add water to the material to prevent the material from overheating.2. Dimensional error for 2mm