The Hercules Violin/Viola Wall Holder is a stable and reliable wall mount that can securely and reliably display the instrument on a wall. It features a hook system with an automatic locking mechanism (Auto-Grip System). The holding hook is covered with foam rubber to protect the instrument from scratches. The Hercules Violin/Viola Holder is compatible with most violins (1/4, 1/2, 3/4, 4/4) and violas (305 mm - 432 mm).