The IMER Gerris 800 is a self-propelled, radio-controlled crawler concrete placing boom, model number 1128758. It distributes pumped concrete and mortar in any position within its range: up to about 37 ft (36 ft 9 in) high, a maximum reach of about 26 ft (26 ft 3 in) and a casting depth of 16.5 ft, with a maximum aggregate size of 1 in.

Three boom sections carry 4 in heavy-duty pipe, and the turret rotates 355 degrees. Transport size is 2 ft 7 in wide, 16 ft 1 in long and 6 ft 6 in high. The Gerris 800 folds up to fit through standard doorways, and the boom needs little room to open, so it can work in places with low ceilings. Four self-leveling outriggers and expandable rubber tracks support setup. Maximum travel speed is 0 to 1.6 mph and gradeability is 25%.

Power is bi-energy: a Honda GX390 (13 HP) gas engine plus a 120V, 1.5 HP auxiliary electric motor for work in closed environments. A radio remote control and a manual emergency pump are standard. The Gerris 800 is designed to pair with the IMER Booster 20 and works with concrete pumps that have 4 in HD fittings. Weight is 5,512 lbs.