Features: Great tool for air rivet hammer, for 80mm, 100mm, 178mm gun air hammer and gas shovel, handle diameter approx. Made of high quality alloy steel, heavy duty high hardness steel, quality chisel bits set. Use for tire repair , windpipe pressure seam edge and so on. Set included: 1pcs spring and 3pcs air hammer bits. Suitable for any hammering operation, such as ball joints and U-joints. Oval-shaped surface for the formation of metal plates, rivets, knock out etc. Gas shovel for supporting the use, and more for tire repair and pneumatic hammer. Installed in the air shovel / air hammer head, can replace the head to use. Use in the automotive industry, sheet metal industry, tire repair industry, construction industry, machinery factory production line, and other industries. Please note : The air hammer drill bits need to be installed in the Pneumatic sewing machine, and connected with the air compressor for using. Package included: 1 x spring + 3 x air hammer bits (gun not included)