This tool was designed specifically for dealing with those small drill holes often found in pearls. Reamers can be used to enlarge and smooth out holes. The sharp, corkscrew-like tips can be used with any pearl. As you use this tool, you will be able to see pearl dust accumulating. Brief instructions appear on the back of the tool package. Handle is made of wood; overall tool length is about 5 inches (12.5 cm). This is the "Very Fine" sized tool (bottom tool in the detail picture), the thicker "Fine" reamer is also shown in the picture for size comparison.