Selden 80mm single backstay, halyard block 5500 lbs 408-201-03r

14mm-9/16" line max, 5500 lbs load, 11,000 lbs break, aluminum annodized sheave with torlon roller bearings and acetal ball bearings for side loads, machined annodized aluminum cheeks. All stainless parts are isolated from the aluminum to prevent corrosion. 10mm pin, 14.5mm spaceing between cheeks