3.50” Rectangle Heavy Duty Comb Adjuster Step Insert3. 50 Rectangle Heavy Duty Comb Adjuster Step Insert Our four way adjustable comb hardware material is made from 6061T6 511 alum. x 1 x 3 rectangle bar with 1 8 radius machined at each corner. Finished in anodized silver or anodized black. Also available in Brass. Top bushing material is made from 6061T6 alum. round solid rod 5 8 diameter, cut to 5 8 height, and precision drilled internally to 7 16 to clear the stainless steel post for a friction free