Steel Dragon Tools 85D Wet & Dry Hand Held Core Drill Rig for Diamond Core Drill Bits Drills up to 5-inch holes in concrete, asphalt, block, brick, and more. Motor: 2,000 W, 115 V, 60 Hz, 2,000 RPM Fits 1-1/4 in. x 7 TPI bits. Fits 5/8 in. x 11 TPI bits. Fits 13/16 in. bits with adapter.