These browning-style scope bases are designed specifically for use on browning t-bolt rifles along with matching browning-style rimfire scope rings.Hey are machined from solid steel with a special double shoulder design that holds rings securely even under heavy use.Made to fit browning-style rimfire scope rings only.Fits t-bolt rifles only.(22lr and 17 hmr)Type: 2-Piece BaseModel: T-Bolt Browning Style Two-Piece Scope BaseStyle: 2-PieceFinish: MatteMaterial: SteelPieces: 2Gun Type: RifleMount Type: To ReceiverRings Included: No