Micro lite narrow kerf chain used in combination with micro lite bars requires less power from the saw than standard cutting systems feautres low vibration, low kickback chamfer chisel cutters have an angular shape with twin cutting corners that offer outstanding performance along with durability and easy, forgiving maintenance comparable to round cornered chains narrow 0.043 1.1mm gauge reduces the weight of the micro lite bar and chain combination by approximately 15% lubrilink tie straps help keep oil where it is needed on the chain top plate witness mark makes accurate sharpening easier lubriwell oil holes in all drive links help carry oil around the full length of the guide bar’s groove recommended for electric saws and petrol saws up to 35cc for bars from 12 to 16 30cm to 40cm specificationnumber of drive links 40 how do i measure the length of my chain? The length of your chain is determined by counting the number of drive links in your chainyour drive link count has a direct correlation to your bar’s lengthbe careful a bar made by oregon may take a different drive link count than that of another producerhere’s a tip count the number of drive links in the chain you have now, and write that number down someplace where you can find itor, if you have an oregon chain in an oregon box, the drive link count is stamped on the flap you can save that flap for future reference make model size cm size inches ryobi apr01 25 10 ryobi apr02 25 10 ryobi apr03 25 10 ryobi apr04 25 10 the models listed above are for guidance onlyplease check with manufacturer handbook to ensure suitable fit and installation instructions