Detailed Product Description Description:The set of 7 bits include 1/4", 3/8", 1/2", 5/8", 3/4", 7/8" & 1" which are made of high-carbon tool steel. They come in a wooden case for protection.Features: Made of high-carbon tool steel Protected in a wooden case Includes: 1/4", 3/8", 1/2", 5/8", 3/4", 7/8", and 1"