The characteristics of fast circular saw are that it can adjust the cutting thickness of various materials up to 5.5 cm at will. It differs from fast direct saw in that cutting metal produces sparks and wears protective glasses when used; it has a saw blade made of gold and steel drill, which can search for any breakthrough faster and more flexibly. However, more attention has been paid to the length of power supply that can provide them to work. The matching 18V rechargeable battery, weighing about 1 kg, can make the fast saw work for about 20 minutes continuously. But with a large battery, it can work for about 90 minutes. If the battery clamp is connected, the power supply on the car can be connected. As long as the generator of the car is started, the fast electric saw can be used indefinitely.
