DualShear ® M55 TwoShaft Shredder SSI's DualShear ® M55 is a lowspeed, hightorque, twoshaft, rotary shear industrial shredder designed to efficiently process a variety of difficult materials.. DualShear ® M55 industrial shredders are versatile machines commonly employed in bulky item reduction, product destruction or preconditioning (primary shredding) where particle size ...