• 110 premium wire thread inserts (Helicoil style) included. Material: High-speed steel (HSS) tools, steel inserts. • Specifically designed for engine block thread restoration. 5 x Twist Drill Bits. Thread Sizes: M5 (0.8mm), M6 (1.0mm), M8 (1.25mm), M10 (1.5mm), M12 (1.75mm).
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