The Tasco 1 inch-to-30mm rings are rock-solid and designed specifically for all types of modern rifles. They are engineered to handle heavy recoil and are secured with four bolt cap screws. They can accommodate scopes with 1-inch or 30mm tubes and are available in low medium and high models to fit an array of platforms.Finish: MatteSpecifications: Removeable 1? aluminum insertModel: TS00602Additional Info: Angle-Loc clamping systemDescription: T15 torx screws 1/2? slotted cross bolt nut