Black & Silver; Square Point Insulation Knife Insulation Knife, 14 gauge (2.11mm) 8-3/4" X 1" X .083" blade uncarded, 3.2lb. 1" wide chrome vanadium steel blade with precision hollow ground cutting edge. Wave blade design cuts foam and most other insulation material without binding. Textured ergonomic soft-grip handle. No-roll shape.