Features: The magnetic cup holder is compatible for different bottles, it fits coffee travel mugs, big or small water bottles, most cups and tumblers. The diameter of the cup holder is 82mm/3.22 in, height is 90mm/3.51 in, suitable for most 10-40 ounce bottles within diameter 3.22". The magnetic cup holder for tractors is made of 304 stainless steel material, which is extremely-sturdy and durable. Our upgraded magnetic cup caddy has a coating-on the outside to prevent rust for improved durability, thus it can be used for many years. There are 6 powerful magnets-wrapped in black rubber(anti-rust/anti-scratch), don't worry about the powerful magnet will scratch the metal-surface. And the magnet can withstand 50lbs of pulling force, don't worry about your cup holder will move around. The powerful magnet attracts to any ferrous metal-surface including tractors/mower/gardening machine. When you are working in the garage/outdoors, you can place your favorite beverage or water bottles in the cup holder. If you want to remove the cup holder to another place, simply lift straights-up. The first-step is to-align the two-holes, then put in the screw and tighten it clockwise with a screwdriver. It is very easy to install the magnet cup holder. Kind remind: the powerful magnet attracts to any ferrous metal-surface, not suitable for aluminum-surface or stainless steel-surface. Specifications: Material:Metal Size:As Picture Shown Color:Black Style: fixed horizontally/vertically Note: .Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. .Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings. Package includes: 1x Magnetic Cup Holder