Die grinders /Straight Grinders and rotary tools are handheld power tools used for grinding, sanding, honing, polishing, or machining material (typically metal, but also plastic or wood). Die grinders are often used for engraving, cylinder head porting, and general shaping of a part. Ultimamac has wide variety of Die Grinders. You can get Original Die Grinders under one roof from Authorized and genuine dealer at the lowest price.