This is the ten piece ProSpec metric tool set from Mugen and contains high quality alloy machined precision tools. The handles on these tools are hollow and light weight for easy use, and the driver tips can be stored in the handle to save on space in your pit box. All the tips on these tools are replaceable, and the set includes the most common sizes needed for wrenching on your R/C vehicles. Each handle is engraved with the tool size for easy identification.