TrippNT's Bottle Holders organize, stabilize and secure 2 bottles. Made from resistant ABS plastic these holders are designed for most 500 mL bottles that will fit a 3-1/8 inch diameter hole. Secure with hardware and keyholes. Ideal for wash bottles, top heavy plastic squeeze bottles and any cylindrical vessel under 3-1/8 inches in diameter. 7. 5 x 3. 25 x 4. 25 inches (width height depth); 0. 3 pounds.