Pit Posse PP3225 Piston Circlip C-Clip Install Installation Tool 20mm The safe and easy way to install circlips into your pistons! Makes the task of installing circlips much easier. Installs circlips quickly and prevents damage to your pistons from improper installation. This is a 20mm piston circlip tool. Instruction sheet included. Also available in 18mm and 22mm sizes. See our other listings!