Metal Construction Timber to Heavy Section Screws - Countersunk - Wing-Tip - Self-Drilling - Zinc

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Metal Construction Timber to Heavy Section Screws - Countersunk - Wing-Tip - Self-Drilling - Zinc Specifically designed to attach wood to heavy section steel (Max. 12mm). Metric th read with wings designed to ream out the timber, so the screw can achieve Max. R.P.M. without burning out. When the wings hit the metal they will break off to permit the thread to self-tap into the metal. Tek Screws For Timber to Heavy Section Steel Countersunk with Ribs Case & Core Hardened Carbon Steel Self-Drilling No.4 Show more