2 Pack - #40 1/2" Drive Chain Offset Half Links These durable #40 drive chain OFFSETLinks are made rugged to ANSI Standards with hardened solid steel pins. Shot peened side plates for stress relief, fatigue resistance and longer service life. Bulk Packaged - No retail packaging. Quick and easy installation with minimal hand tools. Chain Pitch: 0.500" Roller Diameter: 0.312" Roller Width: 0.312" Pin Diameter: 0.156" Plate Thickness: 0.060" Tensile strength: 3800 Pounds Replaces worn half link or used for shortening worn chain. Used with masterlink, not included. If your chain is making a popping / clicking noise or sounds like it is binding when it runs, not running as quiet as it once did , chances are better than average the chain is worn/stretched beyond it's service limit and ready to fail. Order replacements now to have on hand for the inevitable. Please verify the actual size , type or specific # of your drive chain before ordering. We make chains cut to length with one day handling. If you need one let us make it for you. Check the link below for your needs #40 Roller Drive Chain Cut to the length you need - Fast Shipping !!!