A set of three moulds as per IRC-SP-53-2002 made of brass /gunmetal with the shape, dimensions and tolerances. The ends B and B` are known as clips, and the parts A and A’ are known as sides of the mould. The dimensions of the mould shall be such that when properly assembled it will form a briquette specimen having the following dimensions. Total length : 75 ± 0.5 mm