【Sturdy body construction】-- The thicker wall of the 4.5 inch hole saw is made of M42 High Speed Steel and BI-Metal, improves durability and minimizes tooth loss 【Fast & Clean Cutting】 -- Variable Tooth Design and High quality material enhances hole cutter performance - Cuts precise 4.5in holes smoothly in drywall, ceiling tile steel, wood, plastic, stainless steel and mild steel, metal, aluminum 【Come with Arbor】 -- The 4-1/2 hole saw comes with a heavy duty 7/16” hex shank quick change locking-pin mandrel and a BONUS replacement pilot drill bit, a hex key. The hole saw arbor fits all 1/2" chuck drills. 【Deep Cut Style】 -- Cutting depth of 38 mm (1.5"), will cut more material in 1 pass 【12 MOUTHS GUARANTEE】-- With our unbeatable 12 mouths warranty and 30 day 100% Satisfaction Guarantee, buy with confidence! We attach great importance to customer's shopping satisfaction and are willing to solve any problems you have Koopi 4.5" Hole Saw with Heavy Duty Arbor, 38mm Depth Bi-Metal 4 1/2 inch Hole Cutter for Easily Drilling Wood, Plastic, Plywood, Drywall, Thin Metal (114mm)