This aluminium sheave box features a small low profile hook and a variety of sheave options. It is designed to hook into the mast, with the lower lip resting inside and the top secured with a rivet or screw. It is suitable for installation in masts or booms and offers durable construction with a cast aluminium body. Users can choose between two sheave materials, including an acetal plain bearing for low maintenance and a stainless steel dynamic option for maximum performance. The sheave box is versatile, compatible with a wide range of mast and boom sizes, and can handle working loads up to 300Kg.