Reciprocating saw. 12-A motor. Compact. More durable blade holder. Made of steel and plastic. Automatic orbit allows for a lower stroke length tool (1 in.) to cut faster than the RS15 (1 1/4 in.) which has a longer stroke length. Smallest compact tool (no. 7 motor) with same cutting power (12 A) and lower vibration than the predecessor RS10 and RS15 due to a new lighter wobble spindle design. New more durable and more compact blade holder design.