Series 4 58mm Block Fiddle Swivel Becket Cam Block. Swivel. Fully swivelling head with removable shackle. Becket. A clevis forming part of one end of a sheave. Cam cleat blocks. Fitted with Kevlar cams unless otherwise stated . Cam arms are fully adjustable by moving the locking clevis pin to achieve the correct cleating angle. Used in conjunction with the relevant top block, this range of blocks is particularly useful for mainsheet, vang tackles or downhauls on dinghies, dayboats or light cruising yachts. A strong, lightweight range of blocks for use on dayboats and cruising yachts. Ideal for mainsheets, vang tackles, lead blocks or wherever a powerful and compact purchase tackle is required. A comprehensive range of cam cleat, fiddle, and fiddle cam cleat versions are available. Plain bearing blocks. Barton plain bearing blocks have a precision moulded Acetal sheave running on a large diameter brass bearing, ensuring free running under the highest of loads. Length 1 Swivel. Fully swivelling head with removable shackle. Cam cleat blocks. Fitted with Kevlar cams unless otherwise stated . Cam arms are fully adjustab Plain bearing blocks Barton plain bearing blocks have a precision moulded Acetal sheave running on a