These retainers are designed to be mounted on the side of the bed frame and on the center support rail using two pins. Pre-drilled holes can be used to secure them to the bed frame. Made of abrasion-resistant black plastic, they are suitable for all types of bed boards. If the size is correct, no additional tools are required for installation. Simply place the bed slat into the bracket and align the plastic pins with the mounting holes. These plastic caps serve as ideal repair or replacement parts for metal beds, leather beds, wooden beds, sofa beds, and bunk beds. Compatible with spring planks having a width between 57mm and a thickness of 9mm. Color: Black. Material: Plastic. Package Contents: 40 x Bed Base Caps. Note: Light reflection and different display settings may cause slight variations in color between the image and the actual item. Measurement may vary by up to +/- 1-3cm.