Retaining rings are used to secure parts onto shafts. Internal retaining rings are specifically engineered to secure parts to the inside of a shaft.
SK Hand Tool 7669 SureGrip® Internal Straight 90° Tip Retaining Ring Pliers on PopScreen
Pin/Ring/Clip - Retaining Ring - Pins, Rings & Clips - Fasteners - The Home Depot
Wing Nut - Pins, Rings & Clips - Fasteners - The Home Depot
Pin/Ring/Clip - 5 - Pins, Rings & Clips - Fasteners - The Home Depot
Hillman 5/8 in. x 4-1/8 in. Sta-Pin (2-Pack) 967110 - The Home Depot
Wilde Tool Co 527B CS CONVERTIBLE RETAINING RING PLIERS .038 TIP 90 DEGREE CARDED
Hydro Air Retaining Ring & Eyeball Standard Jet Brown on PopScreen
Hillman 5/8 in. x 4-1/8 in. Sta-Pin (2-Pack) 967110 - The Home Depot
SK Hand Tool 7669 SureGrip® Internal Straight 90° Tip Retaining Ring Pliers on PopScreen