300 Series Fairlead Block, Fixed Style, 2-7/32" x 3/4" from SCHAEFER
Same as the Schaefer 200 Series fairlead blocks, but with twice the working load. Use #10 fasteners. Configuration: Lead block. Sheave: UV-stabilized white Delrin®. Ball Bearings: Delrin. Sheave Size: 1-7/16" (37mm). Line Diameter: 7/16". Cheek Material/Finish: Polished stainless.

Series 20 Block, Single Shackle Head, 550lb. SWL, 0.7oz. from RONSTAN
Two-stage bearing system with stainless-steel ball bearings handles very high safe working loads. Designed for small diameter, high-tech line on high-performance dinghies and control lines on sport and race boats. Each double and triple block offers a formed loop head and extra shackle for mounting versatility. Sheave: Acetal plastic. Sheave Size: 3/4" (20mm). Line Diameter: 1/4" max. Cheek Material/Finish: Stainless and textured fiber-reinforced Zytel.

Series 60 Block, Triple, 2,310 SWL (lb.), 16.0oz. from RONSTAN
Ser 60 Triple Block|Ser 60 Triple Block.

Series 60 Block, Double, 2,310 SWL (lb.), 12.1oz. from RONSTAN
Ser 60 double block|Ser 60 double(531889).

Series 60 Block, Single, 2,200 SWL (lb.), 8.5oz. from RONSTAN
Ser 60 single block|Ser 60 single(531905).

5 Series Block, Single with Snap Shackle, Aluminum Cheeks, 5.4oz. from SCHAEFER
Used extensively for sheet blocks on small to mid-sized keelboats and as control line blocks for larger offshore boats. Suitable as mast-base or lead blocks on small to mid-sized boats. Universal three-way head. Black anodized aluminum or stainless cheeks. Stainless straps and posts. Sheave: UV-protected Delrin. Ball Bearings: Plain bearings . Sheave Size: 2" (51mm) . Line Dia. : 7/16" max. .