Hammer insert for discus circles.
The Polanik Fiberglass Hammer Ring is designed to fit inside a standard discus circle, instantly converting it into the smaller diameter required for hammer throw. It’s a practical space-saving solution f...
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The inserts fit great, and because there are seven pieces and they are so light weight they are easy to insert and take out for storage. The test of time will tell on how they will hold up to hammer hits.