For individual users, a simple task that's somewhat tedious only has to be performed once every 2 or 3 years. SBT is designed to make this easy and simple, it's a handy tool especially for unit and agency armorers s that replace batteries for their SROs and RMR HDs annually. Designed for use with a screwdriver that can accept a 1/4 bit, SBT can also be used with the included handle. Follow the MRDS user's manual on battery and cap installation.