Hardened steel hex inserts are permanently pressed into each alloy steel socket. U.S.A. Metric Socket Size mm Hex bits 3, 4, 5, 6, 7, 8, 10, Drive in. 3/8, Material Type Hardened steel hex inserts permanently pressed into alloy steel sockets., Pieces qty. 7. Includes 3, 4, 5, 6, 7, 8 and 10mm sizes
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