The hultafors qc 15 quick clamp is a compact one hand clamp made of nylon reinforced fiberglass 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 designed with focus on compact and slim operation supplied as a twin pack specifcation clamping capacity 150mm throat depth 75mm clamping force 60 70kg rail diameter 20 x 6mm weight 600g