Square Shank Size Classification: 30mm+330mm, 35mm+330mm, 40mm+330mm, 50mm+330mm, 60mm+330mm. Round handle Size Classification: 30mm+330mm, 35mm+330mm, 40mm+330mm, 50mm+330mm, 60mm+330mm. High hardness connecting rod, high hardness, durable, not easy to deform, stable and powerful drilling.
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