1、DURABLE MATERIAL: The outer ring of drill depth stop is made of aluminum alloy material, durable, beautiful and lightweight, the surface with non slip lines, can be manually tightened, simple and practical 2、PREVENT WEAR: The drill depth stop is nylon inner ring, easy to lock, not loose, and effectively avoid wear on the drill bit locking part 3、FLEXIBLE AND ADJUSTABLE: The inner diameter of the stopper can be adjusted, and a maximum of one can be fixed at different positions of the drill to accurately control the drilling depth 4、MAGNETIC ADSORPTION: Drill depth stop collar come with magnet, effectively adsorb limit ring, more convenient for operation, not easy to fall off 5、PROVIDE CONVENIENCE: These drill depth limiting rings are perfect for professionals and DIY enthusiasts to use in production or repetitive drilling projects, making drilling faster and more accurate, so that woodworking work more convenient