There were two pieces. Although I did not understand how to use it well, trying to install using the shorter one of the larger length also failed. The bicycle was made in China, the seat post was imported goods (inch size) so there was a gap between the spacer and the subtle. Even though it is attached to the side of the bicycle at the very bottom, it enters only the tip. It is unavoidable to process by yourself. It cuts with a golden sauce, but since its length becomes shorter when it is in the horizontal direction, cut 1 cm in the left and right where it is cut in the vertical direction, take out the deburred with a file, take off the corner and cut it again and scraping it again little by little , It was possible to install. Since there is also a risk of damaging the post root of the bicycle side machining, it was necessary to adjust the kitchen in consideration of the clearance of both parts.