Big sale Step Drill Bit Imperial 1/4 to 13/8in for Metal 4 Flute Spiral Groove with 8% Cobalt

1、FOUR SPIRAL GROOVES: The step drill four cutting blade design guarantee a faster smoother cut that feel like a hot knife slicing through butter 2、M35 COBALT HSS STEP DRILL: Ideal for stainless steel sheet metal wood plastic aluminum copper and other metal plates 3、HARD AND FAST: With a surface hardness of 89HRC the step drill bit can cut harder materials and achieve higher cutting speeds 4、TECHNICAL PARAMETERS: Step drill bit imperial has drilling diameter from 1/4 to 1?3/8in and a shank diameter of 1/4in 5、WITH BOX: Spiral groove step drill bit equipped with a storage box for easy storage portability and access and also prevent damage and loss