Making cuts in fiberglass insulation requires some skill and a good tool to handle the job. The manufacturer says its new Insul-Knife solves at least the second of these problems. The multi-purpose tool looks like a saw but performs like a razor, providing quick, clean cuts in various types of insulation, including fiberglass, foam pipe, and Styrofoam board. Cost: $35. Cepco Tool Co. 800-466-9626. www.cepcotool.com.