King Tony's part 112004MR is a wrench designed to accept hexagon keys. It is made of tool steel and has a hexagonal shape with a 4mm size and a length of 144mm. This wrench is perfect for fastening and loosening bolts and screws of various sizes. It is designed to be durable and long-lasting. It is also designed to be easy to use and comfortable to grip. It is an ideal choice for mechanics, hobbyists, and DIYers alike.