The Harken 57 mm Zircon Triple Block — Becket utilizes industrial ceramic ball bearings and caged races to optimize performance for seamless sail shape adjustments, making it an ideal choice for trimmers tackling shifting conditions. With options for single or double blocks, and a maximum working load of 450 kg (990 lb) and line thickness of 10 mm (3/8 in), these blocks come with 40 or 57-mm sheaves to suit various needs.