This clamp has a wide 3-inch mouth that can open up to fit onto bars and tables up to 1.5" thick. The mouth has rubber feet to protect surfaces from being scratched. The clamp features a mini-ball head with universal cold shoe mount. On the side of the clamp is a 5/8" stud with a 3/8" mount. At the back of the clamp is a 5/8" receptor to add to the mounting options of this versatile clamp.