The hultafors qcx 15 quick clamp is a compact one hand clamp made of nylon reinforced fiberglass the design of this clamp has been focused on compact and slim operation the steel rail has been forged in one piece with a slim front jaw for increased access in tight places pressure plates with tracked rubber pads to protect the surface and provide increased clamping force supplied as a twin pack specifcation clamping capacity 150mm throat depth 95mm clamping force 100 120kg rail diameter 20 x 6mm