6mm~400mm (1/4"~16")

• No crack even drilling close to the edge.
• No pre-drilling required for screwing into woods.
• Saving manpower and time.
• Excellent grip after installation.
• Quick start and fast penetration into woods.
• Prevent the danger of screw breaking due to nature climate change.
• Perfect for ash, birch, cherry, hickory, oak, rosewood, redwood.

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