The hollow-out design gives great stability and lightweight, embedded structure, with long slip and scratch-resistant silicone padThe L board can be used separately and can be changed into 50mm and 38mm wide Support Arca-Swiss quick-loading expansion 1/4 INCH Thread Holes, 38mm dovetail quick loading plate can connect the bottom plate in 3 directions.CNC Manufacturing of Aviation Grade Aluminum AlloyAluminum alloy surface process: high-end sandblasting anodized Material: Aluminum alloycolour: blackPackage Contents:1 x Quick Release PlateOnly 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.