#100H heavy offset links are also commonly referred to as #100H half links. Offset links are commonly used for adding additional links into a roller chain. Offset links are good to have on-hand because they can keep you out of a down situation, and they are good for making miscellaneous repairs to the roller chain. These offset links exceed in quality, durability, and overall strength. Premier Series #100H Heavy offset links feature heat-treated components, wide contour side plates, shot peened components, and the side plates are Heavy Duty. These offset links are manufactured specifically for #100H heavy roller chain. For more information or if you have any questions please call us or email us, and we will be happy to assist you.