Nylon Snap-In: Designed for ease of use, high strength and ability to absorb shock loads.Nylon Anti-Jamming: Unique design from injection-moulded nylon helps prevent slides jamming, reduces elongation and offers higher strength.Nylon Screw-On: The screw design is strongest and permits easy detachment and re-attachment.Stainless Steel Screw-On: Manufactured in 316 stainless steel with rolled edges to reduce chafe.