12V Precision Electric Sharpener. This sharpener is designed for occasional chain saw users who need a durable and economical tool for hand-sharpening. It runs on a standard 12V auto-type battery or can be connected using an automobile power adapter. Features a built-in depth gauge and a high-impact motor housing for accurate and efficient sharpening. It includes 2 sharpening stones (5/32 and 7/32 inch) and is compatible with replacement stones (sku #s: 123.1554, 123.1885, 123.1851).