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36420 – 5/16″ x 1″ 3-Flute Flat Bottom Counterbore with TiN coated twist drill

$ 34.01

Use SD-3 Counterbores to drill a pilot hole and counterbore a flat bottomed hole in one step. Perfect for lag screws, lag bolts, washer head screws, T-nuts & more. Drive Shank: 1/4″ Hex Power Bit Shank Drill Size: 5/16″ Ø Counterbore Size: 1″ Ø Replacement Twist Drill: Part # 39120 Stop Collar: Part # 33164