The Rock Solid Baby Arm is a solid 15"(38cm) long arm and the entire kit is constructed of aerospace aluminum, including joints, knobs and handles. The Rock Solid Baby Side Ar m Kit is made in the USA and offers the Tether Tools' Lifetime Warranty. The Rock Solid Master Clamp features a 5/8" Baby stud, stud receptor and ¼"-20 threads. The Aero Elbow is designed with TruVu locking technology which adds versatility and secure placement of equipment. The Elbow has a 5/8" (16mm) Baby stud on one end and has a 5/8"(16mm) Baby receptor, as well as a 1 1/8" (2.85cm) Junior Male Stud, and can be independently secured to any grip gear such as light stands, booms or Master Clamps. The Aero Elbow provides 180 degrees tilt and 360 degrees rotation.