This is a spare part for short shock G147 for IF15/IF15W. 2 hole - 1.1mm piston. (3 hole - 0.9mm piston and 1 hole - 1.3mm is also available. This piston is secured with an ultra small screw as used in the IF14-2 to increase stroke. A dedicated 0.05" inch size tool is required. (A0100) INFINITY 0.05" hex wrench driver.