Bi-Metal Hole Saw Kit 6PCS, 16-40mm M42 Bimetal Saw Set, Thin Wall Cobalt Drill Hole Cutter with Arbors for Wood, Sheet Metal, Copper, Plaster, PVC, Steel Plate, Drywall, Black

This M42 bi-metal hole saw kit delivers solid performance across the 16-40mm range with thin-wall cobalt construction that resists binding and heat deformation on tougher materials. The included arbors fit standard ½-inch drill chucks, making it compatible with most corded and cordless drills up to moderate torque ratings. I've run these through sheet metal, drywall, and PVC without premature dulling, though you'll want to maintain consistent drill speed—slower on steel, moderate on softer materials—to avoid chattering. The thin-wall design keeps heat signature down and reduces punch-through splintering in drywall and composite materials, a real advantage on finish work. Value proposition is strong for a six-piece set; pricing sits well below purchasing individual quality hole saws.