This is your One Stop shopping for All our Options for a 25.4mm / 1" Inter diameter (ID) Seat Post Clamps. This Size is used on Vintage Schwinn, Stingray, Lowrider, some Cruiser, and Old School BMX. If your Frame Seat Tube Outer Dimension is 1" inch this is the 25.4mm clamp for you,. Reference note:  If your frame has a 1" OD Seat Tube it should take a 22.2mm Seatpost or a Vintage Schwinn 20.7mm seatpost depending on the seat tube wall thickness.  Your Choice of Colors and Styles from the pull down Menu. You are buying one part, Buy Multiples and Save. Please Read Info, Measure, Know your Options, Make a calculated precise decision, Get what you Need, Be Happy, and Avoid Returns.