Whitworth Tap and Die Set BSW British Standard 23pc Rethreading Thread Repair | DIY at B&Q
BSW British Whitworth Combination Spanner Wrench + Deep Sockets 17pc Set : Amazon.co.uk: DIY & Tools
Fastenerdata - BSW Whitworth Socket Set Screw Dog Point Grade-14.9-45H BS2470 - Dog Point Socket Setscrew - Set Screw - SOCKET SCREWS - DIMENSIONS - Fastener Specifications