This apparatus is used for measuring resistance of an aggregate to crushing. 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. Complete outfit as mentioned above