This o-ring goes around the bullet guide. This o-ring prevents the guide from falling through the bottom of the die when adjusting in and out of your reloading press.
Bottleneck brass reloaders, please see instructions: MB4226.pdf, step # 4 for removing the guide. See step # 6 for the o-ring placement.
Straight wall brass reloader's, please see instructions: MB3659.pdf, step # 5 for removing the guide. See step # 6 for the o-ring placement.
