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Sizes T-5 and T-6 are 6 point star bits commonly used on cell phones and hard drives(no center hole)Sizes T-7,T-8,T-9, T-10 and T-15 are 6 point tamper-proof security bits (with center hole)
Heat treated alloy steel, Precision machined sandblasted bits
Includes 1/4" hex to 1/4" square drive adapter to fit a cordless drill, nut driver, or ratchet.
Includes plastic storage case so the bits you need are always handy