Foxnovo 5pcs Different Sizes Precision Flat Blade Slotted Screw Driver Screwdrivers Watchmaker Repair Tools 0.8-1.6mm Material: durable hard steel and aluminum alloy. 5 different sizes: 0.8mm, 1.0mm, 1.2mm, 1.4mm, 1.6mm. Standard flat blade screwdriver with swivel head, simple and practical. Perfect for repairing watch, changing batteries and screwing the clamp eyeglass frames, etc. Each screwdriver comes with a spare blade for replacement.