The ryobi opp1820 one43 18v pole saw has a tool less chain tensioner that adjusts chain tension quickly and easily for optimum performance its extendable shaft can reach up to 4 metres and the head has a 30 angled cutting head for safer and easier cutting the saw has automatic chain and bar lubrication for prolonged product life bare unit batteries sold separately compatible with all ryobi one43 batteries specification chain speed 55ms chain bar length 20cm weight 41kg