Timber Tuff CS-12V 12-Volt Portable Electric Chain Saw Chain Sharpener High speed motor no-load speed: 12v/200001000r;P1,17W High efficiency point: 16000500r/min;P0,40W PC material cover: anti-ageing & anti-impact 20 degrees/25 degrees/30 degrees at random Stays cool.Includes: 3 Grinding stones sizes; 3/16, 5/32, 7/32 inches