QRT Magnetic Zip Ties Holder System 3 Slot and Singles Variations Very Strong N55 Magnets are integrated in the back and allow for very versatile mounting options as they entire back does not need to make contact with a metal surface. Its OVERLOADED with magnets to allow you this versatile placement options. Unlike others with one or two big mags, ours have long integrated strips along the back. Made to fit 5,8,11 Inch Ties optimally Use for other things such as heat shrink and longer ties just fold them over and push them in. Important Notes All QRT Products are Proudly Manufactured here in the USA using Globally Sourced Materials. Using only the best, Current and state of the art Bambu Lab 3D Printers. Thanks for supporting our small home business. NO TOOLS INCLUDED.