At SUMI Guitar Parts, we leverage our experience working in musical instrument stores and building & repairing guitars to offer high-quality products that "clear a certain level of quality." These are bushings to fix the bridge (preventing it from moving back and forth) on Jazzmaster, Jaguar, Mustang, and other guitars. "4 sets (8 bushings)" The dimensions are: 6.5mm diameter on the bridge post side, 8mm diameter on the anchor side, 13mm diameter on the flange, and 1.5mm thickness of the flange. Notes: Some guitars will fit these bushings easily, while others may not fit quite right (too tight or too loose). If they don't fit, please try the following: If too tight: ・Apply lubricant to the bushings and bridge posts, etc. If too loose: ・Wrap masking tape around the bridge posts, etc. *We cannot address installation issues due to the guitar's own precision (individual differences). For example, if there is a large discrepancy between the bridge hole on the pickguard side and the bridge hole on the guitar body side, the flange of the bushing may interfere with the pickguard and not install properly (it may be possible to install it by shaving the flange). *Please be sure to check the dimensions of your guitar's bridge carefully before purchasing. Shipping is free and will be via Yu-Packet (postal delivery with tracking service) only. *We cannot accommodate requests for other shipping methods without tracking services to prevent mutual trouble.