Double Insulation : An electrical appliance that is double insulated does not have an earth wire fitted. The appliance is designed in such a way that the electrical parts can never come into contact with the outer casing of the device.
Variable Speed : Drills usually have a variable speed trigger, meaning that the harder you squeeze, the faster the electric motor spins the driveshaft. Cheaper models run at a single top speed, but pricier models offer between two and four maximum speed settings.
Bevel Cutting : To cut at an inclination that forms an angle other than a right angle: beveled the edges of the table.