The MK-APC/W air-powered walk-behind concrete saw from MK Diamond has a 9.5-hp pneumatic motor with gear box drive. The tubular-steel design provides a rigid base from which the pneumatic motor is fixed to the blade guard. Designed for tough cutting jobs, the MK-APC/W is well suited for joint widening, indoor floor sawing, trenching and patch work. It will cut up to 7 inches deep with no gas or engine fumes.