This ground rod driver is American made with a deep socket and works with all rotohammers that have the SDS+ shank. This tool is built to last with a 1 year manufacturers guarantee against defects in workmanship and quality from TruCut Galaxy, a division of New England Carbide. It measures 6 3/4" long with an outside diameter on the socket of 1". The shank is the SDS+ (also known as SDS) and that measures approximately 3/8" diameter. This unit may be used with rods which are 3/4" in diameter. It features a one piece machined construction with a long socket. If you are still driving ground rods in with a hammer this is the tool to make the job go quickly. It should pay for itself the second or third time you use it, and that's just the beginning. This tool is built to last with a 1 year manufacturers guarantee against defects in workmanship and quality from TruCut Galaxy, a division of New England Carbide. It measures 5 7/8" long with an outside diameter on the socket of 1". The shank is the SDS+ (also known as SDS) and that measures approximately 3/8" diameter. Overall length: 11-3/4".