High-tech replacement endpin stopper for bass endpins. Manufactured by New Harmony, the company that makes the carbon-fiber bass endpins. This thread-on stopper features soft rubber for the best non-skid grip, and a tough composite insert that won't rattle. Compatible with New Harmony endpins, and our QBC wood endpins. 3/8" x 16 thread. If your endpin is another brand, please check the thread size before purchase; returns due to incompatible thread size are not accepted. Most hardware stores have a thread-size matching device and can tell you what thread you have, if you take your endpin in.