1/2", Diamond Plus Hole Saw, Diamond Plus For Greater Durability & Toughness, Delivers Up To 10 X Longer Life, Higher Grade Diamonds & Improved Braze Provide Best In Class Performance, Large Slug Ejection Slot Offers Easy Plug Removal, Versatile, Ideal For Cutting Anchoring & Clearance Holes In All Tile, Stone & Glass, No Arbor Needed.