GOOD USED 56/48 ALUMINUM SECONDARY CLUTCH HELIX. THIS IS A PERFORMANCE HELIX THAT WOULD HAVE BEEN USED IN A ZRT OR THUNDERCAT AS AN UPGRADE TO THE STOCK 57/50 HELIX THAT CAME ON THOSE MACHINES. THIS WILL FIT MOST CAT CLUTCHES FROM 1993-2003. ALSO FITS SOME NEWER T660 TURBOS AND FIRECATS WITHOUT DIAMOND DRIVE.