Copper Hayes Veterinary own-brand self-piercing bull rings. Long lasting, totally proven in use. Thumbscrew-type locking pin, broken off when tight, reveals cross-slot for screw driver.
The best time to ring a bull is when it is about7 - 10 months old, using a small ring. Change to a medium about 18 months, then to a large at 30 months.
Small: 64mm x 9mm
Medium: 70mm x 9mm
Large: 76mm x 9mm