Optical Screwdriver  Set  with 4 Reversible  Blades Originally designed and widely used in the optical trade. Perfect for jewelers, watchmakers, hobby, camera and home use. Aluminum knurled body and hex swivel head. 4 reversible blades: Philips 000, 00, 0, 1; straight: 1.6, 2.0, 2.4, 3.2mm Made In Taiwan