Press the button to the middle to suspend use and improve safety. Multiple Accessories: With the aluminum head and tungsten steel shaft could connect with 3 universal conversion heads - suit with all the 1/2" Square Drive to 1/4" Hex Adapter, a screwdriver bit, 6 sockets(14mm /17mm/ 18mm /19mm /21mm /22mm), which have functions of disassembly, installation and drilling.