MIP Rollers for the HB D413 are designed to do just what the name implies, ‘roll’; they rotate on the main pin and being that the Roller metal is softer than hardened steel outdrives the roller will not gouge or cut into your outdrives causing you to have to change drivetrain bones and outdrives simultaneously. MIP has Rollers for the front and back of the HB D413 so the entire drivetrain and reap the benefits.
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