The LEGENDARY MicaFILM/Card used for opening virtually any live sprung latch-bolt. This value pack comes with five pieces of MicaFILM in two different thicknesses. The pack includes some handy tips/tricks of the trade from a MASTER LOCKSMITH to help you get the most out of your film. MicaFILM is also used for window catches and aids in use of packed strip on entry to cars too.