This seat post clamp is a great addition to your old school BMX bike. Made of durable aluminum with an anodized red finish, it has a sleek excaliber look that will make your bike stand out. Measuring at 25.4mm, it is compatible with both BMX bikes and old school models. The clamp is designed for use with a 1'' seat post and is a vintage part that will add some character to your ride. Whether you are a collector or just looking for a functional seat post clamp, this is a great choice.