12 inch Stainless Steel Tether Lanyard + Knob Thumb Screw for GoPro Hero Cameras (Black) Made from high quality stainless steel material, durable for long-time usage Stainless steel tether is rust-resistant and can be used in salt water as marine security lanyards as well Loop goes around the screw side and is perfectly sized, does not slip off Two or more units can be linked together to extend its length Attaches to the standard GoPro thumb screw