Oregon 96-900 G3 Gator Blades for 42 Craftsman 138971, 139775, 138791. Blade Width – 2.50. Blade Thickness – 0.187. Blade Length – 21. Center Hole Size – 5 pt. Air Lift – 3/4. Oregon® Gator® G3T 96-900 is your go-to blade in all conditions including wet, dry, and sandy turf. It’s not a replacement blade. It’s an upgrade. High-lift: Aggressive blade angle increases air flow to push debris up and out for superior bagging or side discharge. Cleaner, more efficient cutting performance can reduce bagging needs. Gator® Mulcher feature provides efficiency in normal or abrasive conditions. Major brand replacement: AYP. Listing and template services provided by inkFrog.