Mitee-Bite? OK-Vise? Clamp DK2-WT Double Wedge, Serrated Jaws, M12 x 1.75 Screw, 20,000 lbf Holding Force. This OK-Vise? with M12 screw is designed to be used with the OK-Vise? Multi-Rail in conjunction with Custom T-Nut # 47225. This OK-Vise? can also be used on the Heavy Duty T-Slot Clamp Base # 41000. The double-wedge pull-down clamps generate a pull-down action pressing workpieces down onto the fixture base. Jaw serrations create high friction, which ensures reliable clamping in any circumstances. OK-VISE low-profile clamps expand when they are tightened down, simultaneously pressing the workpieces against the guide and preventing their movement. They are designed to take up very little space on the fastening base. Small in size, yet with an excellent clamping force, these clamps guarantee a holding capacity that clearly exceeds the load of machining forces.?Fastening with only one bolt ensures quick set-up times. Mitee-Bite? Part #47151