A dolly is a great addition to your tripod. Allowing smooth rolling for perfect video shots or just moving around the studio. A single lever braking system controls all three 80mm wheels for positive locking . Included is a 3/8-Inch attachment which allows you to fix a head for low angle shooting. folding legs make for easy transporting and storage. Attachment: 3/8-Inch screw; color: black; diameter: 50.00 in.; height: 3.54 in.; load capacity: 55.11 lbs.; material: aluminum.; weight: 9.9lbs. This replaces the Manfrotto 3254.