Reversible Knife for Diamond MowerTWIN CHISEL aftermarket replacement mulcher knife, second end to reverse and reuse, shank with 1" diameter and 3 4" length, 1 2" thread Compatible with machine brand Diamond Mowers, Ballantine, Promac, Raytree Hardware required, bolt length depends on brand and holder. Note tooth NOT threaded thru, confirm bolt length required for 1 2" to 3 4" of engagement. Interchange number: 22 0045, QMX10290 5T, PBC 20074901