Force 3 Chains (formerly Twin Max) contains patented SealPRO anti-stretch technology and have simiolar, time tested diamond segments. Designed to be used with the full line of ICS power cutters. These chains offer the ultimate combination of affordability. Available in three configurations to match your specific application. The Force 3 standard Concrete chain has a roof top segment design that opens up faster than Twin Max without sacrificing chain life. Premium is the best choice to cut harder agregates and heavier rebar. The Brick chain is best for cutting abrasive materials and brick. for 660GC &* 603GC (discontinued) Models