Forestry and Heavy Equipment tire chains used primarily on Cable and Grapple skidders. All of our skidder chains are Boron Alloy 10B21 Steel. 10B21 Steel wears up to 80% longer than case hardened or carbon steel. Available in 5/8 and 3/4 Tag. To see options for your tire size, please select your tire size in the Search By Tire Size box above. To see options for your tire size, please select your tire size in the Search By Tire Size box above.