Package: 12pcs clamps Made from Stainless steel material. It is compatible with Creality Ender 3 pro Ender 3 V2 Ender 3S Ender 5 Pro CR-20 PRO 3D Printer and other 3D printers This Clips is Spring turn,Upgraded, more stable, Easy to install,remove and hold the glass perfectly. Install: Put the clip under the bed; press the two spring sheets with your finger, slide the clip all the way onto the heated bed and glass bed while please make sure the top sheet of the clips not touch the glass until all the way in position.