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).Select Option 1 - 2in BSPT1/2 - 3/4in BSPT1/2 - 3in BSPT Add to Basket Quantity