Nipped material pieces pass between two rollers. Material is crushed by passing through two rollers and collected at bottom tray. It can be nipped without slippage. Gap between two-roller need to adjust for getting desire material size and out put. Material size reduction ratio is 1-4 per pass. Production rate and energy consumption is affected by changing reduction ratio and differential roller speed. Roll design like smooth, grooved or water cool (for hot material) are offer to suit various requirement. The angle of nip varies for different operation.