Imperial Spanner Combination Set - 6 Piece Whitworth
For some reason now lost in obscurity, the distance across the flats of Whitworth hex nuts and bolt heads is not fractions of an inch or follows any discernable pattern. The sizes stamped on Whitworth wrenches refer not to the distance between the flats, but to the thread diameters. Sizes 1/8 inch 3/16 inch 1/4 inch 5/16 inch 3/8 inch 7/16 inch
Delivery and Returns
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