Poly cup holder for outdoor use. Made of poly (hdpe) material that will last you a lifetime. Holds large cups. Inside dimension of cup holder is 4 inches in diameter. Overall dimension are 7 inches x 5 Inches x 4 Inches. Top & bottom mount. Pre drilled mounting holes. Mounting screws included. Made in the USA. Poly Cup Holder For Outdoor Furniture Chair With Mounting Screws