TAP AND DIE SET 1/4 TO 1/2 BRITISH STANDARD WHITWORTH- BOXED COMPLETE BSW British Standard Whitworth (BSW) is one of a number of imperial unit based screw thread standards which use the same hexagonal bolt head and nut sizes NO OF SIZE: 05 ( 1/4” TO 1/2” BSW) SIZES: 1/4 ”, 5/16”, 3/8”, 7/16”, 1/2” BSW
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