OTC Tools 6982DGS Drilling Guide System Drill perfectly centered holes in broken studs Anchor rail guide on any open hole within reach of broken stud - 6 inch reach 4 bushings for common stud sizes - 6mm, 8mm, 10mm, and 12mm 4 drilling guides for progressive drilling - 1/16", 3/32", 1/8" and 5/32" Conveniently stores in vinyl pouch - includes instructions Lifetime Warranty