Our LiteTouch SealTight Ferrule can be used on hard tubing like stainless steel and PEEK Tubing preventing the collapse of tubing ID. This One Piece, black ferrule comes with a stainless steel lock ring. It is designed for 1/16OD tubing. This ferrule is part of a system that helps prevent the twisting of polymer tubing by gripping tubing at two compression points. It also is available as a single and in a 10 pack.