Carbinex Safe Repair Putty is the perfect solution to performing safe repairs in the field. Reinforced with carbide and steel, Carbinex is engineered to harden within minutes and form a permanent repair that is highly abrasive to drill bits. Placing ball bearings in drilled holes along with Carbinex forms an almost impenetrable hole repair that will dull or chip most drill bits. Carbinex's unique carbide embedded compound is two and a half times stronger than comparable cold weld repairs such as Magic Metal and JB Weld. Made exclusively for repairing drilled holes in safes, Carbinex is workable for five minutes and achieves maximum hardness in approximately one hour. Each stick of Carbinex contains enough carbide compound to repair dozens of safes and has a shelf life of over three years.