Use Snappy SD-3 Flat Bottom Counterbores to drill a pilot/clearance hole and counterbore a flat bottomed hole in one step. The unique geometry of the cutters provide excellent chip clearance and cutting performance, even in hardwoods.Perfect for creating jigs using 5/16-18 bolts andWoodRiver 5/16-18 knobs. Features: Use to drill a pilot/clearance hole and counterbore a flat bottomed hole in one step Perfect for lag screws, lag bolts, washer head screws, T-nuts & more Use to create jigs using 5/16-18 bolts and 5/16-18 knobs 3-flute flat bottom counterbore with TiN coated twist drill Made of thru-hardened alloy steel for long cutting life Specifications: Drive Shank:1/4″ Hex Power Bit Shank Drill Size:5/16″ Counterbore Size: 3/4″ Finish: Titanium Nitride Material: Alloy Steel What’s Included: (1) SnappyFlat Bottom Counterbore – SD-3 – 5/16″ x 3/4″

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