Exmark Replacement Blade - 18" x 2 1/2" x 0.164" - Replaces 103-2518 / 103-6582-S / 103-6582 / 1-303495 / 1-633484 - Mulching Blade Exmark Replacement Mulching Blade (355-022) is a formed blade Replaces (OEM) Exmark part numbers 1-303146, 1-303495, 1-303527, 1-633484, 103-2508, 103-2518, 103-2528, 103-6582, 103-6582-S, 303283, 303495, 633482, and 633484 Fits Exmark Viking and Metro models with 36" and 52" decks (you require 2 of these blades for 36" decks, and 3 for 52" decks) Blade thickness measures 0.164"; Center hole measures 5/8" Length: 18" x Width: 2 1/2"