It looks like this Part has been superseded by LEGO Part 4265b Technic Bush 1/2 Toothed Type II [X Opening].
Click on a colored part below to see the Sets and MOCs that use part 4265a Technic Bush 1/2 Toothed Type I [+ Opening] in that color. You can find an overview of all LEGO Colors here.
If a color is missing, it probably needs to be added to a Set Inventory.
This part has been used by MOCs in the following colors but not officially released.
There are 3 Mold variations of part 4265a - Technic Bush 1/2 Toothed Type I [+ Opening] in the database, in use between 1980 to 1997. See Molds and other related Parts.