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Designed to meet the latest developments in MDF board. Tri Lock threadform and shank incorporates the benefits of a single coarse thread with a twin thread start on the same screw. Spiral point breaks through the hard, dense surface, allowing the twin thread to engage. The twin thread is reduced to a single coarse thread, enabling high pull out retention. Underhead ribs for self countersinking. Zinc and yellow passivated.
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