Check the listing for details. 2 Pcs M8 x 50mm Male Thread Triangle Handle Knobs Hand Clamping Screws Black. Condition: New. Listed at 14.50 USD. The screw knob is constructed from durable plastic for a comfortable grip and excellent corrosion resistance, while the tightly-in threaded stud is made of high-strength carbon steel for reliable clamping force and long-term durability. The carbon steel threads feature a zinc plating that provides reliable rust resistance. Combining a screw-type structure with a triangular handle design, it is easy to operate and improves user efficiency. Its ergonomic triangle shape ensures a secure, comfortable grip, while the precision-made threaded stud provides neat and clear threads, even and deep force distribution, and are non-slip and burr-free. Features a unique triangle-shaped design with smooth lines and a reasonable finger grip spacing for easy rotation. It can be installed and removed by hand without any tools.