The Greenlee nut driver set is independently tested to meet or exceed IEC and ASTM standards. Patent pending Nut-Holding, non-magnetic design won’t collect metal filings. Dual layer of insulation provides added protection against electric shock. This insulated nut driver set includes: 3/16″x6″Insulated Nut Driver 1/4″x6″ Insulated Nut Driver 5/16″x6″ Insulated Nut Driver 11/32″x6″ Insulated Nut Driver 3/8″x6″ Insulated Nut Driver 7/16″x6″ Insulated Nut Driver 1/2″x6″ Insulated Nut Driver Custom Tool Roll Up Carrier