The 30mm exit sheave box offers a high-performance solution for improving the efficiency and durability of your rigging system. Its easy-to-remove axle pin allows for simple maintenance or swapping of sheaves. The box is held in place by either the surface it is mounted on or the included curved backing plate. It is suitable for use in sailboat masts or on any surface that requires the use of ropes or wires. Key features include CNC machined marine-grade aluminum construction for long-lasting performance, a choice of three sheave materials and bearing options, versatile compatibility with a range of mast sizes and applications, optimized rope protection for extended rope life, and various sheave options including acetal plain bearing, dynamic ball bearing, and stainless steel plain bearing for different working loads and uses.