Timco Box of 100 x WingTip Screw SDRILL No4 BIMET – 5.5 x 85 – BMHW85

Specifically designed to attach wood to metal (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. 100 Pieces