Up for sale is a nos vintage original Old School Tuf Neck Style Gold Anodized Forged Seat Clamp. The size is 1"or 25.4mm. The clamp is nos, has never been used, and comes as pictured. I have a few for sale! These are from the 1980's and came with the Suntour clamps I also have for sale! This would be needed for that BMX Bike restoration project! Email with questions or concerns!