Glide Gear Dev Dolly WITH 2 TripodsThe Dev Dolly from Glide Gear is a professional grade slider system. The custom designed base plate and frictionless wheel platform provides glass-like movement while tracking subjects. The two 4' 6061 Aircraft grade aluminum rails lock into the Glide Gear custom tripod mounts to provide a wide range of sliding shots with various focal lengths. The base plate has several 1/4"-20 and 3/8" threaded holes for mounting accessories, three heavy duty wheel mounts, and supports 50 lb depending on your tripod's weight capacity. The custom base plate sled can quickly be lifted off of the rails for easy transport. The front wheels of the base plate can act as a brake by turning the wheel plate sideways, and the track spacers act as a stop guard for the base plate.

https://www.bhphotovideo.com/c/product/1118997-REG/glide_gear_dev_4_dev_dolly.html