BUY BULK....GET 10,000 READY SHIMS ...COMES PACKAGED IN PACKS OF 100. Did you know that THE NATIONAL FIRE PROTECTION AGENCY sets standards for the installation and maintenance of Fire-Rated Door Assemblies. According to NFPA 80, section 6.4.3.4, steel shims are the ONLY acceptable shim to be used when shimming Fire-rated Door Assemblies. MOST commercial installers do not know of this requirement. Our 16 GAUGE STAINLESS STEEL PEEL AND STICK Ready Shim works perfect for Fire Doors and satisfies NFPA 80. These READY SHIMS are REMOVABLE, RESTICKABLE and STACKABLE.Place them behind the hinge to push door towards the strike or to pull away from strike.You'll Shim doors in less than a minute. They work like a charm !! The More you buy the more you SAVE ! CLICK ON THE PICS TO SEE SHIIMMING SIMPLIFIED!!