This is a belt clip that is sold as an add on to many DeWALT cordless tools.
It will come standard with many new cordless tools, so it can also be purchased as a replacement.
This part is sold as a kit and includes the belt clip, the screw, and installation instructions.
It is a genuine DeWALT part, and is only compatible with the tools listed below.
It is sold individually.

This is a genuine Dewalt replacement part, it is sold in individually with the mounting screw.
The Dewalt Belt Hook is attached to the bottom of the handle assembly on the tool model numbers shown below.
Its purpose is to hook the tool to your belt when not using the tool.

Genuine OEM replacement part, this item is sold individually.
This is part of the bit holder system of the Impact Drivers listed below.
Its purpose is to help hold the screw bit in place, once it has been inserted into the bit holder.

Genuine Dewalt replacement part, this item is sold individually.
The N089668 Steel Ball is part of the chuck assembly of the Impact Drivers shown below.
When you pull back the sleeve of the chuck assembly and insert your bit, the Steel Ball is the part that locks the bit in the chuck assembly.

This is an OEM authorized part. It is sold individually. This spring maintains pressure on the N078437 Sleeve, and the rest of the bit holder assembly, to keep the bit in the holder. If this part fails the bit cannot be held in the bit holder. It is commonly used in impact drivers, and is compatible with the impact drivers listed below.

This is an authentic OEM replacement part, sold individually. The Hog Ring holds the bit holder assembly together, it is inserted in the very front of the sleeve. Without it the complete bit holder assembly would completely fall apart. Screwdriver is needed for repair. Compatible with the impact drivers listed below.