High speed steel chaser die set. Suitable for all Coventry die heads and derivatives (OSG, Rubometric, EFEM, etc). Manufactured to original Alfred Herbert specifications. In stock for threads Metric, UNC, UNF, UNEF, UNJF, UNS, BSW, BSF, BA, BSCY, BSB, ME, BSP, BSPT, NPT. Custom manufacture available on request.