CHECK OUT THE VIDEO AT THIS LINK http://www.youtube.com/watch?v=Ax0AMH9Ci1s * MADE WITH 3/16" BASE AND 1/8" WALL TUBES - ROCK SOLID * ALL MOUNTING HARDWARE INCLUDED - INSTALLS IN MINUTES * 3 DIFFERENT GRIP POSITIONS: WIDE AND CLOSE ON ONE SIDE AND NEUTRAL ON THE OTHER SIDE * FITS STEEL I-BEAMS FROM 3.5" TO 10" - 350 LBS WEIGHT LIMIT