Standard, Economy, MT, & Chicken House. All items shown here are manufactured by Lowery Manufacturing. Standard Box Blade 4'- 4 1/2', 5'-5 1/2', 6'-7' -8' Has removable scarifiers and two reversible cutting edges. Economy Box Blade Front View 3 1/2' - 4' -5' - 6' Has removable scarifiers and two weld-on cutting edges. It is recommended for tractors rated below 18hp. 5'-6'-7'-8' -9 1/2' MT Box Blade is manufactured with 4 x 6 tubing, a heavier hook-up, and two reversible cutting edges. Chicken House Box Blade with MT Hook Up is available in 6FT, 7FT, 8FT, and 9FT. Chicken House Box Blade with A-frame Hook Up is available in 6FT, 7FT, and 8FT. 10FT Hydraulic Box Blade Pictured Above.