Set of 2 high quality aftermarket blades for Frontier 72″ (6″) rotary cutters. Replaces John Deere part number 5WP57189KT. These blades will fit the model RC4072 only! Please do not confuse the models RC2072 or RC1072 with the RC4072! Each blade is 28.5 overall length. 26.5 effective length (Center of hole to the end). 1 1/2 hole diameter.