Side Mount Knives come with a carbide insert and with or without beaver tail sealers. MAG50 Knives are 1/2"x2-1/2"x15". The MAG40 Knife is a 7/16" x 2-1/2" x 15" thin knife. Both come with 3/8" tubes closed and drilled to prevent clogging at all application rates. The A50K Knife is a back swept knife with carbide insert with 3/8" tube.