Mitee-Bite? OK-Vise? Clamp DK2-VT-RS Single Wedge, Serrated & Smooth Jaw, M12 x 1.75 Screw, 14,500 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. This model comes with one smooth jaw for use when no marks on the workpieces are permitted, and one serrated jaw for high friction clamping. 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 #47147