SwirlyGig SG1000 Original Drink Holder for 1/2 Tubing, Black Holds most beverage containers securely on a 1/2 inch Mic stand or any 1/2 inch vertical tubing Black Grip area coated in non-slip PVG The inside of the basket is 3 inches x 4 inches on the black version, and 3 1/8 inches x 4 inches on the silver version