CH Hanson USC00830 1/2-Inch Insulated General Purpose Wrench General purpose single ended wrenches Handles are insulated with Nylon 11 and a thumb warning stop is built into handle while the head of the wrench is exposed steel Nylon 11 is the most abrasion resistant and impact resistant insulation for electrical and live line working hand tools Longer lasting and safer and most comfortable wrenches available Lifetime warranty on the tool and insulation