The Libec BL-75 is a 75mm tripod adapter with a bowl clamp that can be used with Libec slider rails ALX SR4, ALX SR8, ALX SR12. It has a dual base design consisting of a 75mm ball base and a flat base bottom. The flat base, featuring a 3/8"-16 mounting thread, can be useful for attaching the head to various other flat base gear. Designed for both 75mm ball diameter and flat base tripods, made to fit sliders, skater dollies, and other equipment. Allows direct compatibility with the ALX T tripod as well as other flat base tripods.