Stihl PS 90 Arboriculture SawThe STIHL PS 90 includes all the features you need for uncompromising cutting ability. Its 12 blade is an excellent size for a wide range of cutting jobs and is recommended for branches up to 4 in diameter. Its ergonomically designed handle features a comfortable, non slip grip. And its curvature ground blade shape reduces pinching and provides better contact with the limb. The impulse hardened teeth stay sharp three to four times longer than