PRACTICAL --- The electric chainsaw sharpener measures approximately 7.9"x3.0" (20x7.5cm) and is very portable. Equipped with three sizes of grinding wheels: 4mm, 4.8mm, 5.5mm, basically meet your different needs. Save your time---Sharpening of your chainsaw with a hand tool (like a hand file) can take over half an hour at a time. But with the 55W Electric Chainsaw Sharpener, you'll be sharpening your knife in less than 10 minutes, more efficiently and less time - saving. HIGH QUALITY MATERIAL -- - The electric chainsaw sharpening kit is made of high quality alloy and copper, the rotor wire can withstand 200 degrees, the pure copper core is more durable, and the clamp has better locking force. The spindle is locked, the grinding wheel is easy to replace, and the service life is long. ACCURATE AND VERSATILE --- Angle plate design for easier alignment and more accurate blades. Features an adjustable speed switch. Comes with 0.16"/4mm for small 3/8 chain, 0.19"/4.8mm for 325 chain and large 3/8 chain, 0.22"/5.5mm for 404 chain.