Set of 7 ampule screwdriver bits in sizes 2 mm, 2.5 mm, 3 mm, 4 mm, 5 mm, 6 mm, 8 mm for a 1/4" shank. TOPTUL tools are designed for the most demanding tasks. Precisely selected materials, high manufacturing accuracy, and resistance to deformation and cracking determine their great popularity and excellent reputation. Combined with exceptional surface finish and affordable price.