Order Today to get your equipment back to in top shape. Billy Goat Brush MOWER Replacement Drive Chain These rugged drive chains measure 39" with 78 pins/rollers including a master link for ease of installtion. Our Premium #41 chains are made rugged to ANSI Standards with hardened solid steel rollers and pins. Shot peened side plates for stress relief and longer service life. Bulk Packaged - No retail packaging. Quick and easy installation with included master joiner link. Chain Pitch: 0.500" Roller Diameter: 0.306" Roller Width: 0.250" Pin Diameter: 0.141" Plate Thickness: 0.050" Tensile strength: 2100 Pounds This part is compatible with the following machines: Billy Goat HW651SP TRACTION ASSEMBLY Billy Goat HW651HSP TRACTION ASSEMBLY If your drive chain is making a popping / clicking noise or sounds like it is binding when it runs, not running as quiet as it once did , 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 measure and verify the actual # of links or the overall length of your drive chain before ordering. If the chain you need is longer or shorter, contact us, we will make one especially for your needs.