Greenlee 0253-03NH-INS Insulated Nut Driver Kit is rated to 1000V AC and exceed both ASTM F1505 and IEC 60900 standards. Built heavy duty for longer life. Designed with precision heads and rugged, deep sockets for better screw clearance and fit. Ergonomically designed for more comfort and torque. Load nut and tap bottom of handle on any surface to hold. Use a screw to remove the nut. Dual layer insulation provides added safety and protection against electric shock. Patent pending non magnetic design won't collect metal filings, works with stainless steel and brass.