Professional chainsaw bar from Husqvarna. X-Tough solid chainsaw bars are machined from super-tough chrome-moly steel and come with improved rail hardening to give you excellent resistance to wear and chipping. The latest replaceable sprocket nose design comes with sealed bearings and is securely held in place by 3 rivets. Noses do not need to be greased anymore. The patented nose sprocket design is held in place by 6 rivets, giving superior resistance to sprocket nose failures. Advanced oil hole and oil hole dam lubrication features increase oiling efficiency and retention with less oil hole plugging issues.