These are brass threaded BSP pipe fittings used for joining pipes in water and heating systems. They are made of top-quality nickel-plated brass (CW617N) and are chrome plated. The fittings have a male to male connection with sizes of 1/2" x 3/8". They can withstand a maximum temperature of +100C and a maximum pressure of 1.0 MPa (10 bar). The weight of each fitting is approximately 0.044 pounds.