We have found these spacers to work very well with installing tail weights into the back of a lure. Many times your weight drill isn't real tight to the lure weight so the tail grommet can move. We've found that adding one of these grommet spacers in can keep the wire/grommet fixed better in the center of the lure. Each fits their particular diameter very well, and allows you to center the tail grommet in the lure so it doesn't move freely. It also will easily space a tail weight out if you drill a lure too deep when building :)