Drop forged, combination wrench / spanner set by Rolson, a UK based company. A set of Whitworth tools for your old british motorcycle or car is necessary, due to BSW or British Standard Whitworth hardware. Your standard or metric tools will never fit right and will round out your bolt heads. This set of 8 wrenches includes 1/8 WW, 3/16" WW, 1/4" WW, 5/16" WW, 3/8" WW, 7/16" WW, 1/2" WW, and 9/16" WW wrenches. Perfect (and necessary) for working on your vintage Triumph, BSA, Norton or other vintage British motorcycle or car.