1-7/8 inch hole saw M42 -8% Cobalt Diameter: 1-7/8" M42 bimetal with 8% cobalt Equipment: pillar drills, lathes or hand-held power drills For cutting circular holes from thin-walled to thick-walled material with a flat or convex workpiece surface. Suitable for materials such as steel, stainless steel, brass, copper, cast iron, light metal, wood, plasterboard and plastic panels etc. Use of lubricant will increase the tool life (metals) Teeth are alternate & side set to minimize binding and friction, requiring less feed pressure, provides a smoother cut and better chip clearance, preventing clogging and heat build-up.