Hole Cutters, Hole Cutter, Primary Saw Application Wood, Max. Cutting Depth 1/4 in, Arbor Design Built-In Arbor, Tooth Material High Speed Steel, Number of Teeth 14, Thread Size 3/8 in, Replacement Arbor No. Mfr. No. 925-022, Shank Size 1/2 in, Replacement Pilot Drill No. Mfr. No. 925-002, Application Wood, Plastic, and any Machinable Metal