ST7 is used for refining toughed out areas of your sculpture, especially after using ST5 Rake. ST7 works well with most sculpting materials. This is not a digging tool, rough treatment will shorten the life of your tool. This tool has a round side and a flat side to fit your sculpting needs. This tool also features a 5" handle for comfort, both ends are crimped for durability and double checked for a tight fit.