3 caliber is suitable. Specially used for pruning in apple orchards, 3-caliber pruners can be equipped with an extension pole. The length of the extension pole is 1.3-1.9 meters. It can also easily prune high branches, so 3-caliber pruners are suitable. Apple is a deciduous tree. Usually trees can be as high as 15 meters, but cultivated trees are only 3-5 meters high. The trunk is gray-brown and the bark has fallen off to a certain extent.