Ridgid 52880 Model M57 2 1/4" Bi-Metal Variable Pitch Hole Saw Outperform and Outlast traditional standard pitch models. Bi-metal construction With Teeth made from pecially hardened type M3 High speed Steel. The varying Teeth height and gullet Sizes result in much faster cutting and longer life. For wood; mildtool and stainless Steels; cast iron; Brass and aluminum. Features: Depth of cut: 1 1/8" (28 mm). Use Ridgid Thread Cutting Oil on all metal except cast iron. 2 1/4" Saw Size & Hole Diameter
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