Perfect Size:3/8" Diameter Cutting Knife is ideal for removing Spot Welds. Suitable for: double-sided blades with high efficiency. Especially for use on iron/cast iron/alloy steel/carbon steel/die steel/die sharpener/drill holes/car body ovations,etc Easy Separation: Spot welding cutter drill quickly separates stain-welded panels without deformation Stable drilling, small incision resistance, high speed, not breaking the border, ideal for removing spot-welded panels or metal plates without deformation of the metal or damaging the underlying panel Dimension: double sided 3/8" High Speed Rotary Metal Cutting Blade, 1/4" Standard Size Arbor with Flats to eliminate Spinning in Chuck, the tool kits can provide better panel separations than a panel cutter. The welding knife is double-sided rotatable and separates highly effectively spot-welded plates than a panel cutter. This prevents the risk of pause in the middle of a task by drilling boring blades slowly and stably when using the bits and using the high temperature (not included) to maximise the life of the blades. The high temperature lube is the best way to extend the blades, but there is no need to use this tool. Simple the Blades get dull. Technical data: Color: black/silver Material:HSS Diameter: 8 cm, Color: grey Box contents: cordless drill with knock function, 1 1 x cutting drill with double cutter 10 x additional 3/8 inch cutters. 2 x pilot pins.