Features. The solid aluminum head is perfect for working on aluminum bodied vehicles because there is no cross contamination of unlike metals which can lead to galvanic corrosion. The aluminum hammer kit is essentially maintenance free. Lightweight hammers provide the tech with a better work method due to the fact aluminum panels stretch more easily than steel. The softer impact and force prevents this automatically. Genuine hickory oval handles provide a solid base with less chance of breakage. Three different heads are included in this kit - Pick and Finishing Hammer Round Face 40 mm. Curved Pein Finishing Hammer Round Face 40 mm. and Standard Bumping Hammer Round Face 40.5 mm. Square Face 38 mm.. Each hammer has a red mark on the top of the head to indicate the tools are for aluminum use only. Keep the hammers isolated when not in use in the included blow molded cases