From high precision to a wide range of applications, this Drill Bit is your best choice. This 4 x 75 mm drill bit is made from tough, durable steel and offers added strength when performing drilling tasks of every type. The shank diameter is 3.8 mm, while the working length is 40 mm; hence, it provides excellent performance at any job.-Silver and Grey-Size (4x14.6x0.7)