These Browning-style scope bases are designed specifically for use on Browning T-Bolt rifles along with matching Browning-style rimfire scope rings. They are machined from solid steel with a special double shoulder design that holds rings securely, even under heavy use. T-Bolt two-piece scope bases are only compatible with Browning's unique rimfire rings. These bases are trim and low and they will look great on your T-Bolt.