Test Weights of 50kg down to and including 5kg are made of high quality pig iron conforming to grade 15 of IS : 210 : 1962 as per IS 1056 – 1965. Shape is hexagonal tapered upward. Weights have one rectangular loading hole on the under surface, tapering outwards along the width. Weights have cast-in-handle made of mild steel conforming to IS: 1977-1962. They are finished smooth and free from pits, blow-holes and other defects. Only lead is used in the loading hole so that it may not come out easily. They are protected by a corrosion resistant paint of black colour. The error in excess permissible for adjusted new weights shall not exceed its limits.