This apparatus is used for measuring resistance of an aggregate to crushing, as per IS: 2386, (Part 4) Made of mild steel, it comprises: Cylindrical Cell, 150 ± 0.5 mm ID x 130 to 140 mm height Plunger, 148±0.5 mm dia x 100 to 115 mm height Base Plate, 200 to 230 mm square x 6 mm thickness Tamping rod, 16 mm dia x 450 to 600 mm length Metal measure, 110 ± 0.5 mm ID x 180±0.5 mm height.