LMT Onsrud 70-180. 1/2" CD x 3-1/4" OAL LMT Onsrud 79-160 2" Dia, 0.095" Thick, 16 Teeth, Carbide Tipped Designed to trim and groove both hard and soft plastics. These blades run in conjunction with the blade arbors. Blades are reversible for right or left hand rotation cutting.