The Backstage Magliner Mic Boom Grip & Base (Small) is designed to be attached to Backstage upper and lower shelves and Magliner convertible carts. However it can be attached to any flat surface that is less than 3/16" thick. Each bracket has 8/32" bolts. Drilling of the surface mounting area is needed. It will accept booms or poles with a base diameter of up to 2-1/4" and a diameter of 1-1/2" at the point that is 22" above the base when mounted on one of the carts.