Catfish Pond Driveline Assembly, size 6. Driveline minimum C-to-C is 41" (1041 mm), maximum C-to-C length is 62" (1580 mm), and total collapsed length is 48" (1230 mm). Tractor ends: 1-3/8" 21 Spline and implement ends are 1-1/2" round bore with 3/8" keyway. Driveline rated as category 4 (100 hp).