Features and Benefits: Great for removing seized/rusted fasteners, even in tight spaces, all made of S2 Steel and backed by a lifetime warranty. kit includes:PDUJ101 -" Sq. dr. Power Drive UJ Adapter PDUJ102 -3/8" Sq. dr. Power Drive UJ AdapterPDUJ103 - " Bit Holder Power Driver UJ Adapter PDUJ104 - 5/16" Bit Holder Power Driver UJ Adapter;