Bi-metal holesaws with a varied-pitched tooth design. Ideal for cutting steel, aluminium, copper, brass, wood and plastics, with a range of sizes picked to suit a variety of plumbing jobs. Supplied in a handy carry case. Cuts Aluminium, Brass, Copper, Plastic, Steel & Wood Steel Slotted Barrel to Aid Removal of Debris 19mm - 57mm Dia. Holesaws For Use with 3-Jaw Chuck Machines on Rotary Action Sizes Related to Plumbing Needs Cuts Through Various Materials Quick Cutting & Long Life Variable Tooth Pitch Cuts Aluminium, Brass, Copper, Plastic, Steel & Wood Steel Slotted Barrel to Aid Removal of Debris 19mm - 57mm Dia. Holesaws For Use with 3-Jaw Chuck Machines on Rotary Action Sizes Related to Plumbing Needs Cuts Through Various Materials Quick Cutting & Long Life Variable Tooth Pitch