1" BSCY Carbon Steel Split Dies BS 811 1" B.S. Cycle carbon steel circular split dies for British Standard Cycle external threads. These UK made dies are mainly used for cleaning, chasing and restoring existing BSCY threads on bolts, studs, threaded bar and other male threaded components. The... £8.72 (Inc. VAT) £7.27 (Ex. VAT) Choose Options Compare