Seat Post for Vintage Schwinn bikes, 13/ 16 , 15 1/2 " long and has a top of 7/8 to accept modern style seats , this post is for all vintage Schwinn's cruisers and Sting-Ray's , post fits perfectly in the seat post tube and has a 7/8 wide top to accept all modern seats. A must have for a proper custom rebuild. save money with combined shipping , Made by Wald.