High Quality: The precision mechanical screwdriver bits are made of high-precision chrome vanadium steel, which is wear-resistant, , and impact-resistant. They are not easily deformed or broken. Each set of precision mechanical tools is perfect and can open almost all tools. As you work, make sure you choose the correct screw size and screw type for your drill, as choosing the wrong bit can easily damage it. Precision Mechanical Screwdriver Set: This set contains up to 120 pieces, allowing you to perform professional repairs. The set includes the necessary tools and plenty of screwdrivers to help you with your DIY work. The set includes the main tool, the handle - the base of the screwdriver - and up to 98 bits in sizes and shapes. Wide Application: The precision mechanical screwdriver set can be used to repair most household appliances, electronic products and other precision equipment. , air conditioners, fans, refrigerators, etc. PCs, computers, laptops, tablets, cameras, game