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This review is from: Bosch 1.1mm Saw Chain for AKE 40/AKE 40-17S / AKE 40-18S / AKE 40-19S Chainsaws (DIY & Tools)Don't be tempted to buy a non-Bosch replacement. I did this and it stretched beyond use in a very short time. Don't force the saw or the chain will blunt very quickly. I have used this chain to cut through several large trunks and branches within minutes. Never allow the chain to catch on the ground, or worse a brick, nail or concrete. If you do the chain becomes unblanced will begin to vibrate in your hands or even jump its tracks as well as not cutting well or maybe not at all. Check and fill the oil chamber every few minutes also spray a little WD40 into the gearing and along the chain at the same time. Check and adjust saw tension at the same time. The chain will not last for ever and it is possible to hand sharpen them. I have tried this on two chains but the chain will never be the same and will blunt again after a few minutes. Not worth the bother as it takes about half to an hour to do it properly. Of course use protective gear on head, eyes and legs and never be tempted to cut above chest height or one handed. I use a helmet with a pull down face mesh. Always plan that the piece you are cutting will naturally fall away and NOT close up and pinch the saw or you could seriously damage the saw or yourself.