Yacht Blocks – Max Dia Line 10mm – Sheave Dia 45mm. The Barton Size 3 (45mm) Fiddle Block w/ Swivel is a strong, lightweight range of blocks suitable for use on dinghies, dayboats, and cruising yachts, ideal for mainsheet, vang tackles, lead blocks, or wherever a powerful and compact purchase tackle is required.The 45mm sheave size 3 block range incorporates modern design with stainless steel frames and the latest advanced materials, using 30% fibre glass-filled nylon and Acetal sheaves to maximise their strength whilst keeping weight to a minimum. Suitable for use as mainsheet, vangs, lead blocks, or wherever a powerful and compact purchase system is required on dinghies, dayboats, and lightweight cruisers.FeatureIt can be used as a mainsheet block for the Topaz sailing dinghy. Used in conjunction with a stand-up spring to make a Topaz Mainsheet Standup Block as under: OPEX1304SpecificationsWeight: 145 gDimensions: 150 60 28 mmSize: 3 (45MM)Block Type: SwivelNo. of Sheaves: FiddleBearing Type: PlainSheave Size: 45mm x 13mm (1 3/4″ x 35/64″)Max rope diameter: 10mm (3/8″)SWL: 400kg (881lbs)Break load: 800kg (1763lbs)Max rolling load (ball bearing blocks): 270kg (595lbs)Brand: BartonDownloadFact Sheet .input-wrapper a { text-decoration: none; / Removes underline / background-color: transparent; / Ensures no background color / } .input-wrapper a:hover { text-decoration: underline; / Adds underline on hover / background-color: transparent !important; / Removes grey highlight / }