Easily add more weight to your inserts or glue in points with Gold Tip's FACT weight system. Weight screws into the back end of matching Gold Tip inserts and may be attached before inserts or points are installed or after with the use of an extended FACT weight wrench (sold separately) that goes in the nock end of the arrow. Helps archers achieve the 8-12% Front of Center (FOC) recommended for most hunting applications.FeaturesNock adapter for added rear weight on .246 shafts.166 available in 10 & 20 gr..204 available in 10 & 20 gr..246 available in 10, 20, & 50 gr. (fits larger target shafts)