T.C.T Hole Saw1. 3-ply cutters reduces tip crack even with hard use, and the edge of knife adopts super quality alloy material, which is applied to drilling in cold/hard metal or stainless steel plate;2. The 25mm effective length enables this hole-saw to drill thick steel plate as well as curved face material like thick-wall metal pipes etc.3. The abrasion reducing design heightens durability of hole-saw to great degree, besides, with lighter and faster drilling campared with previous flat edge products.