The semi-circular screw links are excellent choices where three-way loading will occur, such as in a harness. Many hardware stores sell screw links which are intended for repairing chains. These are not good choices in a critical situation. Many of the MR screw links listed here are adequate to accommodate ropes up to 5/8″ (16 mm) in size. The semi circular model comes in a galvanized steel version which is certified as PPE (Personal Protective Equipment). Made in France.