Crescent, Wiss, Weller and Xcelite Products. Crescent-quality and innovation in wrenches, pliers and screwdrivers since 1907. Weller has been the leading brand in professional-quality soldering equipment since 1945. Wiss products have been earning their reputation for craftsmanship and long life since 1848. The Xcelite brand of precision hand tools has been a favorite of service technicians for over 75 years. It is now known throughout the electronics industry for its full line of high quality precision.