Designed to provide you with a better sports’ bicycle experience the PRO Fine Adjustment Screwdriver Set is the ultimate tool for fine adjustment jobs on your bike. With 2 and 2,5 Hex, Japanese Industrial Standard #1 and Flat screwdriver heads the Fine Adjustment Screwdriver Set is a must have tool kit for delicate jobs. HIGHLIGHTS - Must have tool for fine adjustments. Perfect for micro-adjustments required for 11- and 12-speed rear derailleurs. Set of 4 screwdrivers. Hex: 2 and 2.5. JIS #1. Flat head screwdriver