PICTURES ARE REPRESENTATIVE OF ITEM, BUT ARE NOT OF THE ACTUAL ITEM. Product dimensions, finish, head markings, thread length, stamping shape or forging shape, etc., may differ from picture. Products are guaranteed to meet the specifications to which they are manufactured. Specifications allow for tolerances in dimension and shape, which can vary from lot to lot. For use in applications where periodic manual adjustment is required and where finger pressure can supply suf- ficient tightening torque. The washer face-design allows the head of the screw to seat flush against the mating surface and guards against over-tightening the screw which could strip the mating threads. 303 Stainless Steel. Aluminum Alloy 6061 T6.