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A. The set covers two thread systems: a BSW (British Standard Whitworth) range from 4 to 62 BSW, and a metric pitch range from 0.25 to 6.0 mm, across 52 individually stamped folding leaves.
A. The set contains 52 blades. Each blade is individually stamped with an accurately formed thread profile and folds away neatly within the gauge body when not in use.
A. The Draper 51072 is sold loose as a single 52-blade screwpitch gauge set.
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