Size of Bits: for T10 for T15 for T20 for T25 for T30. for T30:6mm. All for Torx bits have a centre bore. for T10:4.0mm. Magnetic bits are firmly fixed on screwdrivers. Type of Shank: Hex. Those for Torx Screwdriver Bits are made of alloy steel which is a commonly used material in hardware with high hardness.
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