The screwdriver is usually not a good bad screw screwdriver, because it often implies a lack of precision screwdriver, between the cutter head and the screw groove surface force into force, caused by excessive local stress and damage to the screw. Therefore, the screw driver not only depends on the hardness and toughness, but also depends on the manufacturing accuracy.
The ordinary screwdriver is usually slightly larger, including more than one word 3mm or more than PH1. It is used for daily repair of household appliances, such as TV sets, washing machines and assembly furniture, etc..The precision screwdriver is distinguished by price. The following brands are all good, including 3-6 commonly used screwdrivers:200 yuan or more sets: import professional tools, hardness, accuracy, ultra-high, comfortable use. The representatives are Europe's three major brands: German Wiha, Wera, Swiss PB.The level of 100 yuan package: Japan whiskers (vessel), domestic South flag etc.. Accuracy and hardness are acceptable. Comfortable use.50 yuan following suit: you can go to the X treasure to buy your own, first look at user evaluation, pay attention to whether it is easy to wear the head, whether damage screws, brands have treasure work, and X treasure all kinds of hot brands.The common screwdriver, which is still the best professional products to the number of European Wiha, Wera, PB, Felo (German dragon), FACOM (France, United States Snap-on Falcon). A single screw is usually priced at 30-100 yuan (depending on the material and size). Economical and practical, has Sata America Stanley (STANLEY) and so on, only the price of 3-15 yuan. If your request is low, I think these above or a little expensive, then you can also go to X treasure, look at user evaluation, select a number of domestic economic brands.
Buy a screwdriver, first of all, you want a screwdriver or an ordinary screwdriver. Second, look at personal budgets, affordable prices, and personal definitions of "good".Precision screwdrivers usually include the following numbers below the word "3mm", below the cross PH1, for the removal of notebooks, cell phones, cameras, repair glasses, etc., for small screws.
The material, the bottom is carbon steel, better is the addition of various elements of alloy steel (chrome vanadium steel, chrome molybdenum steel, etc.) is the best chrome vanadium molybdenum alloy steel. Well-known professional foreign enterprises, but also often use their own patented high hardness special steel.
