Lower Blade / Honda 72511-VK6-000Pack Size:1Honda 72511-VK6-000Dealer Choice 50-3048, J. Thomas HD-5100, NHC 212-3251, Oregon 92-101, Rotary 12615Honda HRC216 K2 HXA; 21" deckLength: 21 1/4 ", Center Hole: 3/4 ", Outer Hole: 3/8 ", Center To Center: 3 3/4 ", Width: 3 1/2 ", Honda code 7869381, Thickness: .120 "