The Harken 22mm Upright Block, Part No. 243, has a 22 mm sheave diameter and a maximum line diameter of 6 mm (or 7/8 in and 1/4 in, respectively). With a maximum working load of 91 kg (or 200 lbs), these blocks are designed to provide low-friction performance for smaller sailboats and dinghies, and are suitable for a variety of control lines on boats of all sizes. Compact, lightweight, and efficient, these blocks are sure to meet your expectations.