The milwaukee m18 bset2a 513b twin pack contains the following 1 x 18 volt m18 bpd compact percussion drill is a compact high performance percussion drill that measures only 198mm in length making it ideal for confined spaces its high performance 4 pole motor delivers maximum power whilst maintaining the power to weight ratio it has a full metal gear box delivering maximum performance and long life with a 13mm metal chuck for quick bit changes and bit retention chuck 13mm no load speed 0 4500 18