Heavy Duty Mulching Blade Replaces John Deere OEM part#'s: M136185, M136194, TCU14939 and TCU30315. Rotary# 10284, 15-10284; A&I Mega-cross# M96770, B1PD5138, A-B1PD5138. Specs: Length: 17-3/64" - Width: 2-1/2" - Center Hole: 0.904"(29/32") - Thickness: .250". Fits 48" John Deere 7-Iron Deck. Order (3) blades for 48" cut. For a non-mulching, hi-lift, blade, use our Part# JD330150.