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Works with all standard water bottle cages made to mount on a bicycle. Two threaded holes ( M5 x 10 mm long), one 5 mm clearance hole , and one 5 x 7 mm slot to insure fit. You may notice in the third photo that the bracket accommodates the waist strap from a backpack style disc golf bag. If you use the Zuca, or Dynamic EZ cart like shown this upgrade is a no brainer. Use the screws that came with your cart to mount the plates to the uprights,. Then use the M5 screws provided to fasten the drink holding cages to the U bracket.