3/8 holes in aluminum uprights and the grills legs secures the grill to the plate by a round lock bar, The lock bar is 3/8 inch round 304 stainless steel.Drilled a hole in the end of the lock bar for a lock to prevent theft.Presently just have a hitch pin clip. Bent one end to serve as a handle to pull out locking bar. Will be adding some sound deadning materials