Adjustable depth stop which allows you to drill out just the spot weld and not the panel beneath Drill bit removes the entire spot weld, eliminating the need for grinding Kit includes: Air Spot Weld Drill 5.5" Deep Clamp 4 - Drill Bits (2-8mm, 2-6.5mm) End Line Oiler (3000) 3 Way Swivel (3SB10) Plastic Blow Molded Case Specifications: Drill Bit Size Chuck Cap.: 5/16" Free Speed: 2,000rpm Overall Length: 8-3/4" (222mm) Air Inlet Thread NPT: 1/4" Avg. Air Consumption: 4cfm