SMC MKB20-20RZ-M9PVSAPC Cylinder, Rotary Clamp MSRP: Now: $264.15 Was: MK-Z Swing Clamp Cylinder, Standard w/Auto Switch Mounting GroovesSMC s MK-Z has an allowable moment of inertia 3 times higher than the conventional MK and MK2 styles. The overall length is the same... MKB20-20RZ-M9PVSAPC