If you need to punch holes in gaskets, leather, plastic, rubber or vinyl then this set is a must have. Heat treated carbon steel construction makes this a durable set of tools while the diamond pattern grips allow for a no-slip hold under your hammer. The range of 12 sizes detailed below also make this kit extremely versatile.Features include:Made of heat treated carbon steelSizes include: 1/8, 5/32, 3/16, 7/32, , 5/16, 3/8, 7/16, , 9/16, 5/8, inch Diamond pattern gripIncludes retail package