Tool for forming the screwdriver blades in "T" shape. The utilization of this tool avoids screw scratching by the operator. To obtain desired shape, adjust the gap between the 2 round stones according to blade diameter. Mainly used by watchmakers who repair high range of watches with blue or gold screws. Supplied with: 3 stones (1 square and 2 round) 3 screwdriver holders sizes Ø4.30mm, Ø4.80mm & Ø5.30mm Replacement For Horotec MSA01.502 Dimension 130 x 50 x 45mm