Size：T8,T10,T15,T20,T25,T27,T30,T40. The Hole In The Center In Each Bit Causes It To Be Tamper Resistance. Material：S2 Steel. Made Of High-Quality S2 Steel, With Sturdy Hardened & Tempered Construction, Perfectly Matched To Most Standard Tamper-Resistant German-Made Star 6-Point Screws.
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