1. Look at the packaging: Hengfeng impact electric drill set is made of blue plastic box with many grids and various accessories. The packaging is very textured and can be carried by hand. 2. Check the security code: Hengfeng impact drill each product has its own unique security code, which can be obtained by scraping the blocked layer. The trademark words of fake products are obviously different. You can inquire through Hengfeng official website 3: Look at the price: Hengfeng is a big brand of electric tools, so its price includes a certain brand value besides its cost, so that the price of Hengfeng impact drill will not be very cheap, after all, good goods are not cheap. 4. Equipped with secondary connection protection: the real Hengfeng impact electric drill product is equipped with secondary connection protection to prevent the wire from being damaged, but the fake one is not. Of course, this can only be seen after it is opened. 5. No oil leakage: The real Hengfeng impact electric drill is equipped with an oil leakage imitation device on its electric hammer. As long as there is no accident, it will not release oil leakage. 6. More durable: the real Dongcheng electric drill can be used for a long time under normal circumstances. Only professional punchers have to punch thousands of holes a day before they will be scrapped in about 3 months and cannot be used. Nothing else will happen. Angle grinder: a kind of angle grinder using glass