This is the premium rig for professionals. The ultimate combo of durability and precision. The Stiff Arm PRO has the “beef” to hold that expensive camera system of up to 18 lbs. With the tensioning lever tool on our patent pending ball joint leveling system, you can secure the arm at almost any level on a tree or branch. The stiff arm has the features of our other arms, but with increased strength all the way around. The base has double layered plates and comes with two heavy duty ratchets for increased security of your system. This arm includes 1/4-20 and 3/8-16 thread options for Fluid Head mounting. Kit also includes a Cam Lever to further secure shoulder/base connection. After using the Fourth Arrow Stiff Arm Pro, you will never want another camera arm. This is perfection and strength.