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RIDGID Pipe and Bolt Dies for Machine Die Heads. Requires British model die head. Pipe dies for use in British Universal die heads (NOS. 504A, 811A, 815A, 816, 817, 856, 911 & 913).RIDGID Threading Machine Dies Size: 1/2 - 3/4in BSPT.Die Material or Type: Alloy RH.Additional Information:• Machine Type: Threading Machine Dies