Features:3.Plastic center caps for holding and securing wooden slats on the bed base4.The caps actual inside dimension: width 55mm x height 11mm.5.The distance of 2 plastic pins on the plastic caps are 35mm.6.Slat caps ideal for the replacement of any broken or missing slat capsNote:Please allow 1-2mm error because of manual measurements.Much thanks for your understanding.Installation instructions: The key door outlet is connect to the regulator (red terminal), the regulator (yellow terminal) is connect to the F terminal of the generator, and the ground is automatically grounded after the regulator house is fixed.Specifications:Material:PlasticColor:BlackBrand name: BQLZRInner Hole Size:5.4x1cmSize:5.5x1.1cm or 2.16x0.43inch(LxT)Height:2.7cmWeight:369gPackage include:50 x Bed Caps Holders Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.