How to get the screw out??? the hole has become a circle, tried

Salient Features of ASS-4 Automatic screws groove slotting cutting machine screw groove slot cutting,double cutter milling design

Captive Screw, M4 X , Flare-in, PhillipsSlot Combination, Knurled Black Knob

screw slot file SK Surgicals' precision-engineered 2mm single slot screws With High-quality stainless steel, designed for controlled, accurate insertion in maxillofacial

screw slot File slots in small screws or narrow slots of any kind by using a screwhead with tang files These files come in three different thicknesses