Ruike electrical screwdriver set is a 9 pieces electrical insulated set. It is use for tightening and loosening screws and it has a unique design with tester capacity of 100-500AC. The big and soft grip is for high torque screwdriving and great comfort. it comes in different size and type in the bag and every bit has a hexagonal base that slide easily into the tip of the screw. It is use to repair, fix and mending work.RUIKE 9pcs Screwdriver setsAdvance chrome vanadium steelPP+TPR handle.The design of handle matches human-body engineering theory. Size: 3X75, 5X100, 6X100, 6X150, 6X200, PHOX75, PHIX100 PH2X100, PH2X150 100-500AC Tester. Ruike electrical screwdriver set is a 9 pieces electrical insulated set, it consist of 5 flat screwdriver and 4 star screwdriver.