Originally designed and widely used in the optical trade, this set is perfect for jewelers, watchmakers, hobby, camera and home use. Aluminum knurled body for a sure grip and hex swivel head that won't roll off your bench. Four reversible blades for a total of eight tips, four Philips and four straight blades. Blades easily snap in and out of handle. Sizes include Philips: 000, 00, 0 and 1; straight: 1.6, 2.0, 2.4 and 3.2mm for an excellent range. The screwdriver is a great combination of quality and bargain.