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T-10 and T-15 fit Brownells, Burris and Leupold scope ring and base screws. Ball-head driver can be held as much as 25deg off angle and still grip the screw tightly with no slipping. One-piece, hardened, steel shaft gives excellent strength and reach; tough, fluted handle provides a solid grip and great control. Mfg: Bondhus SPECS: T-10 - 5'' (12.7cm) long. 23/4'' (7cm) long shank. T-15 - 51/2'' (14cm) long. 27/8'' (7.3cm) long shank.