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#40 BB Fiddle With Becket 7/16'' Ronstan has combined the latest cutting edge bearing technology with the most up to date construction and design techniques to produce their new Series 40 Ball Bearing Blocks. The result is a block that is incredibly strong for its size, with working loads up to 60% more than most other blocks of comparable size. The secret to the Series 40 Blocks' incredible strength is a unique two-stage bearing system. Under light and moderate loads, Acetal ball bearings ensure virtually frictionless rotation of the sheave. Under heavy loads, a sliding Acetal bearing on a polished stainless steel race takes over, maintaining low friction performance and ensures the sheave will continue to rotate properly. Made from durable, light-weight, precision molded UV stabilized Acetal, the cheeks have bearing cut-outs making it easy to flush out sand and salt, and the sheaves have a specialized rope groove that suits all modern fibers and braids. With exceptionally high working loads and a compact low profile, Ronstan's Series 40 Ball Bearing Blocks are typically used for mainsheet, halyard, vang, and spinnaker control applications on boats such as off-the-beach catamarans, one-design keelboats and sport boats up to 26 feet in length, and for many control lines on larger boats. Sheave Diameter 11/2'' (40mm).