This unit has a 400mm front roller 6 inch with shields as standard on our units. The motors are upgraded for double to torque and slower speeds to increase grip on rubber parts when powered by main engine or power pack. Roller bearings in S/S with extra seals to prolong life and keep any sand or grit out of housing. Units still have thick S/S horns for no worries fishing on hang ups from groves with horns in Ali. Materials are all Marine grade 5083 Marine Ali frame and 316 S/S horns. Main drum can be turned round for extra life. This unit can be powered by a power pack or main engine, just tell us then we can change motors to suit your power supply. Happy to answer any questions just give me a call.