Pro-Grade 13pc Tamper Proof Torx Star Bit Set T-4 To T-40 - Taiwan by Pro Tools Full size-range of TORX (aka star) bits in tamper-proof/security configuration (hole in center) Hardened & tempered CrV steel for durability, resists twisting, cam-out; pro-quality, made in Taiwan Precision-machined tips for superior fit and functionality; includes PVC holster to keep organized 1" length x 1/4" hex shank to fit drill chucks, impact drivers, driver handles & bit holders 13 most-used sizes: T-4, T-5, T-6, T-7, T-8, T-9, T-10, T-15, T-20, T-25, T-30 & T-40