Can effectively progressed the drilling efficiency. Spring-loaded guide centering the integrated bit within the hole of the door hinge, cabinet hinge, bracket, or hardware the place the middle gap is required. Hinge for the doors and windows hinge screw hole, positioning accuracy, won't shift, the sawdust from the drill hole on each side of the end facet of the automatic discharge will not caught bit. There are 5mm and 1/4inch drill bits that you may choose for dull holes in numerous sizes,Shank Hexagonal Design. Colour:black Material:high velocity metallic Package Contents: 2 x Hinge Drill Bit Only the above kit content, different merchandise will not be included. Note: Light reflection and diversified reveals may cause the color of the thing within the photo a bit diversified from the real thing. The size allowed error is +/- 1-3cm.