The patented construction has been developed in cooperation with Markusson Development, a company which has many years experience of automatic chain sharpening machines. The sharpening robot revolutionizes the work with chainsaw mills, and you get the luxury of always having a perfect chain on your chainsaw. If you like, you can sharpen your neighbours' chains too. Besides sharpening automatically, it also makes the chains amazingly sharp. Without having any scientific evidence, we can state that the edges of the cutting teeth feel sharper than on a new chain, and this is clearly noticeable when you are sawing. It can sharpen both 1.3 picco chains and ordinary 1.6-3/8" chains, but also 0.325 chains. Both the tooth angle and the cutting angle are adjustable. Read more at: http://www.logosol.com/toolbox/automatic-chain-grinder/