It is for determining the aggregate impact value and has been designed in accordance with IS: 2386 (Part 4), IS: 9377-1979. The sturdy construction consists of a base and support columns to form a rigid framework around the quick release trigger mechanism to ensure an effective free fall of the hammer during test. The free fall can be adjusted through 380 ± 5 mm. The hammer is provided with a locking arrangement. Following model of Aggregate Impact Value Apparatus is available: