The Siler flint lock is available in two sizes. The large plate is 5 1/4" x 15/16"; the small plate is 4 3/4" x 13/16". Except for size, they are identical in apperance. The large lock is available in right or left hand, but the smallest lock is available only in right hand. these flint locks are interchangeable with their Siler percussion lock counterparts.