This is a specification for a heavy-duty 15-foot offset flex arm rotary cutter, requiring 12-ply tires with a 4,000-pound load capacity and capable of cutting in-line or at offsets up to 122 inches. It must feature a 2.5-inch castor pivot shaft, six-bolt hubs with 6,000-pound capacity, and bolt-in axles, plus spring steel bushings and induction-hardened pins at pivot points. Hydraulic and mechanical needs include at least four circuits with independent wing lift, a heavy-duty 3.5-by-36-inch welded cylinder, and an optional six-port selector valve kit for tractors with limited outlets. Power delivery must support a minimum 200 horsepower at 1,000 RPM while also accommodating 540 RPM tractor output, and a safety lighting kit is required. Standard transport width totals 121 inches, with a configuration of 70 inches left and 52 inches right; an alternate stop-block setup adjusts this to 55 inches left and 66 inches right for narrow-road clearance.