The IMER HSM 12 (model 1130121) is a towable horizontal shaft mortar mixer with a 12 cu ft steel drum and a Honda GX 390 gas engine rated at 13 hp. It mixes mortars, stuccos and grouts, with a bag capacity of 3.5 to 4 bags and a 12 cu ft batch output.

Power reaches the paddles through an enclosed gearbox, which runs quieter with less heat and gear wear; the noise level is under 79 dB. Pillow blocks are mounted externally. An extra large safety grate is standard, a locking handle prevents unexpected dumping, and the unit has forklift pockets.

The HSM 12 has B78-13 in tires, a 58 in charging height and weighs 1,200 lbs. It measures 52-1/2 in wide, 56-1/2 in high and 84 in long, or 104-1/2 in with the tow bar. A 2 in ball hitch tow bar is standard; a pintle hitch is available but must be selected at the time of purchase. Spiral mixing blades (up to 30% faster mixing) and a torsion bar axle are optional.