"For use with the Metal Pro Ironworker MP 4000, Item# 971662, and the Metal Pro Ironworker 4500, Item# 971640. Includes sizes 1/32in. larger than the bolt size for alignment and clearance. This allows clearance holes for 1/4in., 5/16in., 3/8in., 7/16in., 1/2in., 5/8in., 3/4in., and 7/8in. bolts. U.S.A."
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