METAL SHIMS--5 X 3 INCHES WITH 1/2 INCH GROOVES. NOS. I HAVE 3 KINDS. 1ST ONE IS THICKER. THE SECOND ONE IS HALF THE THICKNESS OF THE FIRST ONE. THE THIRD ONE IS RAW STEEL. ALL HAVE THE SAME MEASUREMENTS. NOT SURE WHAT THEY CAN BE USED FOR BUT I HAVE HUNDREDS OF THEM. ILL POST A PRICE FOR EACH BUT ILL GIVE BETTER PRICE IF YOU BUY LOTS.