30mm pulley for 6 - 10mm rope. Allen Brothers with ball bearings. - - 30mm pulley for 6 - 10mm rope. Allen Brothers with ball bearings. Suitable for: - Cadet - Contender - Europe - Mirror - Laser - Marauder - Moth - Optimist SINGLE WITH SWIVEL HOOK A2030SHK 30MM BLOCK W/SWIVEL A2030SC Technical documents can be downloaded here