These drill bits are made of S-2 stainless steel material, high hardness and high strength, the hardness is up to 62HRC, wear resistance, and can ensure long working time. Made of hardening process for maximum accuracy and stability. High accuracy concentric shaft design for easy centering, sandblasting surface, prevent slippage, not easy to break. 3 sets of specifications available, with high drilling efficiency, 12pcs 50mm, 11pcs 75mm and 11pcs 100mm, you can choose according to your requirements. Features: Made of high-quality S-2 stainless steel material, with high hardness and high strength, wear resistance, and can ensure long working time. Made of hardening process for maximum accuracy and stability. High accuracy concentric shaft design for easy centering, sandblasting surface, prevent slippage, not easy to break. Humanized design, these bits are designed with magnetic, strong magnetism, easy to absorb and pick up screws. 3 sets of specifications available, with high drilling efficiency, 12pcs 50mm, 11pcs 75mm and 11pcs 100mm, you can choose according to your requirements. Suitable for home, auto repair, electrical repair, electronic product repair, machinery repair, etc. And it can be used with electric drill, electric screwdrivers and impact driver. Specifications:Name: electric drill bit setMaterial: S-2 stainless steelType: 12pcs 50mm, 11pcs 75mm, 11pcs 100mm(Optional)12pcs 50mm: T5, T6, T7, T-8, T9, T10, T15, T20, T25, T27, T30, T4011pcs 75mm: T6, T7, T-8, T9, T10, T15, T20, T25, T30, T35, T4011pcs 100mm: T6, T7, T-8, T9, T10, T15, T20, T25, T30, T35, T40Product weight:12pcs 50mm: 105g/3.70ounce11pcs 75mm: 135g/4.76ounce11pcs 100mm: 170g/6.00ouncePackage size:12pcs 50mm: 70*70*15mm/2.76*2.76*0, 59in11pcs 75mm: 120*70*15mm/4.72*2.76*0, 59in11pcs 100mm: 120*70*15mm/4.72*2.76*0,59inPackage weight:12pcs 50mm: 110g/3.88ounce11pcs 75mm: 140g/4.94ounce11pcs 100mm: 175g / 6.17ouncePacking List (12 pcs 50mm, 11 pcs 75mm, 11 pcs 50mm, 11 pcs 100mm optional):1*electric drill bit setMany questions about Dropshipping service are following:1. How many orders can you handle per day? We are a large company in Shenzhen, China, with a large warehouse that can handle large orders every day. We ship countless packages every day. We can guarantee the order you request.2. How fast can you process orders? We will arrange the shipment as soon as possible after you pay for your order. Priority delivery for dropshipping order3. Can you ship an order without any receipts, invoices and promotional offer inside the package? Absolutely! No invoices, receipts, promotional offer if you leave notes on the order (if you want, we can deliver.)4. If you need other products? We can supply most of the products you need as much as possible1If you have any other questions, please feel free to . We are very grateful for your cooperation with you.5. We can support Dropshipping of CSV/Excel files.6. There is no limited inventory to fulfill orders on a daily basis