RUKO 2-blade spiral step drill 1/2 cobalt high speed steel 101707E 1 piece

Catalogue number: 101707E Features: ●High-quality materials are used, allowing stable drilling without load or vibration. Applications: ●Cutting materials: Steel plate (strength 900N/mm2 or less), brass, aluminum, plastic (up to 4mm) Specifications: ●Step width (mm): 4 ●Number of steps (steps): 2 ●Drilling dimensions (φ): 3/8, 1/2 ●Surface treatment: Non-coated ●Drilling dimensions: 3/8, 1/2 ●Shank diameter: 1/4 ●Non-coated Material/Finish: ●Cobalt high speed steel