TIMco Self-Drilling Wing-Tip Steel to Timber Heavy Section Silver Screws - 5.5 x 45 - 200 Pieces
TIMco
Product Code: HW45B
Specifically designed to attach wood to heavy section steel (Max. 12mm). Metric thread 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.
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