Sufficient precision screwdriver kit:There are extra alternative blades of each size to replace the screwdriver in case of losing or not working, as well as a mini keychain screwdriver to carry with you, which can satisfy your demands on dealing with emergencies of fixing eyeglasses or watches. Thoughtful presents of watch makers screwdriver set:The electric precision screwdriver are practical present tools for mechanics, proper for sending to your father, friends, neighbors and watch repairman, proving an effective way to repair or fix, saving their time and energy at work. Size: Length: about 8.8 x 0.8 cm/ 3.46 x 0.32 inch Flat head: 0.6 mm/ 0.024 inch, 0.8 mm/ 0.032 inch, 1.0 mm/ 0.039 inch, 1.2 mm/ 0.047 inch, 1.4 mm/ 0.055 inch, 1.6 mm/ 0.063 inch, 1.8 mm/ 0.071 inch, 2.0 mm/ 0.079 inch head: 1.2 mm/ 0.047 inch, 1.4 mm/ 0.055 inch, 1.6 mm/ 0.063 inch, 1.8 mm/ 0.071 inch, 2.0 mm/ 0.079 inch Colour:silver Material:tool steel Package Contents: 13 x Mini precision jewelry screwdrivers 13 x Replacement blades 1 x Demagnetizer 1 x Keychain precision screwdriver Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.