Determining the aggregate Impact value of coarse aggregate.Consists of a base weighing between 22-30kg with a lower surface of not less than 30cms and support columns to from a rigid frame work around the quick re. lease trigger mechanism to ensure an effective free fall of the hammer during test. The free fall can be adjusted through 380 + 5.0mm. The hammer is provided with a locking arrangement. A metal tup (Hammer) weighing13.5 to 14.0 kg. The lower end in cylindrical shape, 100mm in diameter and 5cm long with a 2mm chamber at the lower edge and case hardened.Complete with a cylindrical cup, 102mm dia x 50mm depth, One measure 75mm dia x 50mm deep and tamping rod of circular cross section 10mm in diameter and 230mm long rounded at one end.