Schaefer Marine Series 7 Stand Up Ball Bearing Swivel Block - 2-3/8in 60mm. Stand up spring keeps block upright when not in use. Stainless steel base spreads load out and may be used with 97-49 backing plate. Specifications for Schaefer Marine Series 7 Stand Up Ball Bearing Swivel Block: Manufacturer: Schaefer Marine Color: Black Package Contents: Schaefer Marine Series 7 Stand Up Ball Bearing Swivel Block Schaefer Marine 706-62: Series 7 Stand Up Ball Bearing Swivel Block - 2-3/8in 60mm