HOLE SAW KIT BI-METAL 14 PCS, Sizes 1/2" to 2-1/2"HOLE SAW KIT BI METAL 14 PCS, Sizes 1 2" to 2 1 2" Cut smooth, precise holes in wood, plastic, aluminum, brass, steel alloys even stainless steel. Alloy steel body is electronic beam welded to M3 high speed steel cutting edge for tougher, longer lasting teeth Variable tooth set for less vibration Slotted for easy plug removal Pilot bit with 135 split point for fast, skate free penetration Durable enamel finish won't rust or corrode Heavy duty solid