The stainless steel E-clip set is made of high-quality stainless steel, which is and anti-rust. These stainless steel E-clips can be snapped into the machined grooves on positioning pins or other parts to allow rotation but prevent lateral movement. The retaining snap opening ring circlip kit has 6 different sizes of circlips, which can be used for different purposes and projects. The external circlips are all packed in a resealable plastic box for easy carrying and storage. The external retaining snap ring circlips kit includes 120 circlips, so you dont have to worry about the snap ring being used up in a long time.