Our PTFE glides are designed for moving furniture with ease. They are suitable for furnitures such as sofa, desk, chair, bed etc. You can move furnitures easily even if heavy items. Our furniture gliders can prevent floors from scratching and reduces noise when move your furnitures around the room. Don't worry about damaging your expensive furniture and carpet. These furniture sliders are made of material , which can make sure for periods of time. Screw Deep: 13mm/0.51inch Type: Round with Screw Installation Guides Step 1: Use a tape to measure and mark the depth you need to drill. : Use a drill bit to drill a hole according to the tape deep. Step 3: Put a slider onto the furniture leg and drill the screw. Step 4: Stand the furniture to check the stability and start to slide. colour:Blue gray + black Material:PTFE size:25 x 7mm Package Contents: 48 x PTFE Base Sliders with Screw Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.