1/4" bit holder can fix various 1/4 in. driver bits Metal material, durable and portable, flexible out shield protects your hand while inside shaft rotates Shaft can bend up to 300 degrees perfect flexibility to replace nuts, bolts and fasteners in narrow space Bit holder keeps fasteners and bits secure while driving It can be either used for general cartridge-type hand drill or electric screwdriver. Mainly used in computer chassis, electrical cabinets, furniture,electrical appliances and other narrow space screwdriver can not work in an environment, Manufacturer: SENRISE