This is the Park Tool RP-Set Snap Ring Pliers Set. Designed and built with the specific needs of the bike mechanic in mind. The RP-SET features three forged pliers made for internal snap rings and one for external snap rings. Includes: RP-1: .9mm straight internal. Opens from 22mm down to 0 (tips touching). RP-2: 1.3mm bent internal. Opens from 22mm down to 2mm (center to center). RP-3: 1.3mm bent external. Opens from 2mm (center to center) up to 18mm. RP-4: 1.7mm bent internal. Opens from 21mm down to 2mm (center to center).