ST2 Medium It is used for smoothing surfaces easily when a medium finish is needed. ST2 works on most sculpting materials and is great for refining edges of prosthetic sculptures. This is not a digging tool, rough treatment will shorten the life of your tool. Each tool is double ended with a 5" handle for comfort (2 flat, 2 round, 2 slant, 2 points, 1 large and one small of each). Each tool is crimped and double checked for tight fit.