Probably the most important features is the reversible cutting direction. If you've ever used a grinding machine or cut-off device where you could not control in which course the sparks travel, you'll appreciate the ability here to invert the reducing direction to send sparks away from you. Absolutely no longer will you have to reposition your body and head at uncomfortable angles to avoid spark contact-simply flip the switch and the sparks fly 180 degrees away from you, others or flammable objects. 

Air Angle Grinder

Cordless die grinders are relatively recent introductions to the market. Their structural housing design delivers great strength at minimal weight. Including the variable speed functionality, often with safety locks, these are very safe to use. Additional protection is offered by microprocessor controls that monitor tool operation as well as temperature in cordless die grinder. Good vendors usually offer warranty and compatibility between tools, batteries and chargers as well as advanced technology and design in their cordless die grinders.