Anchor, Tool, Locking Dog Assembly, 10,000 ft-lb rating. Complete Standard Locking Dog Assembly bolts to Kelly Bar Adapter and attaches to Anchor Drive Wrench. STANDARD Locking Dog Assembly has six holes for 1/2″ bolts on a 5-1/4″ bolt circle, comes with six 1/2″ Grade 5 bolts, nuts and lock washers.