Nylon rail fitting clamps. Use to mount any glass, binocular or bottle holder to a steering pedestal. Requires no holes to be drilled in railing. Clamps mount to railing by simply tightening the wing nut. Quick release design allows quick and easy removal for storage. Use for all sorts of accessory installations: glass racks; binocular holders; botle holders and other items. Fits 3/4", 1" to 1-1/4" railings.