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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 - 2 1/2in BSPT.Additional Information:• Machine Type: Threading Machine Dies