Clamp Hook Mounting Hardware-Non-Adjustable-Use to drop a solid seat 3.0" below a 1" dia seat rail.Designed to bolt under seat rail for non-removable applications. 1/8 Stainless Steel construction designed to be dependable and durable for all types of applications.Rounded and deburred edges,full 1.5" slot adjustment for ease of mounting.Available in two finishes,natural stainless or textured black powder coat. Seat rail fasteners included.