Meets your requirements : Precision milled profile tips for a perfect fit – high-quality steel reduces wear and increases the lifetime. Simplifies your work : An extensive range for all standard micro-fastening purposes in the precision mechanics, model-making and electronics sectors. Makes handling easier : 65 pcs. micro-bit set available as an optimum starter range ½ single bits can also be purchased later. Product dimensions : 28 x 4 x 4 mm (LxWxD) Application : For particularly small screws. Standards : DIN ISO 8764-1 DIN 3126, ISO 1173, Style C4