Designed for boats of all sizes, the Harken 1.00 Wire Thru Deck Block features lightweight, low-friction wire blocks that can carry wire halyards and high-strength control lines. Part number 302, with a sheave diameter of 25 mm (1 in), can handle a maximum working load of 454 kg (1000 lb) and accommodate wire diameters up to 3/32 in (2 mm).