This is a set of 2 replacement vise jaws. We are unsure which style of vise these fit as they bolt on, through the REAR of the jaw insert, not through the front like most. Please see pictures. The jaws measure 4-1/2 inch wide. 1-1/4 Tall and 5/8 inch thick. The bolt holes are 3 inches on center and are positioned 3/8 inch from top of jaw to center of hole and 3/4" from each side. Threads are 1/4-20. The numbers stamped on the jaws are 903197 507. These are old stock jaws purchased from a factory that closed in the late 90's, these are quality made.