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Schaefer 2" 5 Series Flat Base w/ Alum. Cheek & Delrin BB Sheave footwear-size-chart Mainsheet systems and spinnaker sheetsProduct Description Schaefer 2" 5 Series Flat Base w Alum. Cheek & Delrin BB Sheave 5 Series Cheek Block with Anodized Aluminum cheek and Delrin(tm) ball bearing sheave. Delrin(tm) ball bearing sheave provides low friction and high safe working load. Stainless steel base distributes loads to a large surface area. Specifications: Sheave Dia.: 2 in. (51 mm) Max Line: 7 16 in. (11 mm) Width: 2 7 32 in. (57 mm) Length: 3 5 8 in. (32 mm) Height: 7 8 in.