5 Piece Precision Screwdriver Set for Watch Repair, Watch Bracelet with 5 Extra Blades Screwdrivers feature non-slip knurled 3? (7.5cm) stainless steel jeweler?s handles (the top of the handle freely rotates or spins). Comprises of 5 color coded handles with five tempered steel blades of size 0.80 mm, 1.00mm, 1.20mm, 1.40mm, 1.60mm; a spare set of blades is included.