Specification: 12-60mm ​Meterial: HSS-4341 ​Length: 70mm ​Working depth: 5mm ​Shank: 12-45mm(6.35mm Hex Shank),48-60mm(3/8 Hex Shank) ​ ​ ​1.Made of 4341 high-speed steel material, the crown step design can prevent the drill bit from being stuck, suitable for electric box drilling。 ​ ​2.The handle adopts a 6.35mm hexagonal handle, which can be quickly installed and removed。 ​ ​3.Suitable for thin metal materials, stainless steel less than 0.8mm, iron plate 2mm, aluminum alloy 2mm, plastic 4mm, etc. ​ ​4.Control the drilling speed when drilling, and add water or coolant to cool it properly, so as not to damage the drill bit due to excessive speed。 ​ ​5.Not suitable for metal pipes, the crown step is easy to get stuck and cannot work