Feature:* fresh excessive quality*Easy to install and save space*Sturdy steel material, coating, not easy to rust, waterproof*They are designed to be screwed into the headboard and foot board of the bed body to hold the centre beam in place.Specification:*Material: stainless steel*Colour: Black,*Size options: clip 50mm, clip 32mm, clip 35mm,clip 40mmPackage Contents:1 pair of mattress connecting connectorNote:1. Due to many factors similar to reveal brightness and lightweight brightness, the particular color of the thing may be slightly different from the image displayed on the website.2. Please enable slight handbook dimension deviation within the data.