BOXO International manufacture of circlip pliers, retaining ring plier such as:
External retaining ring pliers External circlip plier Internal retaining ring pliers Internal circlip pliers
Straight Retining Ring Pliers (External Ring)
90° Retaining Ring Pliers (External Ring) 
Straight Retaining Ring Pliers (Internal Ring)
90° Retaining Ring Pliers (Internal Ring)