Features: Brand new and high quality A precise hole drilling: HSSCo with 10mm round shafts and 135° tip angle and according to DIN338 for drilling a precise hole in the metal. Superior Performance: Precisions ground drill bits for fast drilling result with low contact force without prepunching or predrilling. Strong: quenching at temperatures and hardness up to HRC62-64, wear-resistant and highly toughes. materials: HSSCo twist drill bits suitable for metals, stainless steel, cast iron, alloys steel, hard plastics, wood, etc. How different: Our goal is to make the best product more comfortable and safe lifestyle. We have a professional product monitoring team that focuses on all details. Specifications: Material: Alloys Diameters: 25mm, 15mm, 20mm, 17mm, 22mm(optional) Package Includes: 1PC Metal Drill note: Please allow 1-3mm error due to manual measurement. make sure you not mind before bid. Due to the differences between different monitors, the picture may not reflect the actual of the item.