The Dewalt N042665 Screw is used on a number of Dewalt cordless tools to attach the belt hook the tool. This is a phillips head screw. It is also used to attach the Dewalt N268199 Bit Holder Bracket.
This replacement chuck screw is specially manufactured for Dewalt drills and drivers. It is a genuine OEM sourced hardware that is used to secure the chuck to the spindle. Please note, this hex socket head screw is sold individually and is a left hand thread. You will need a hex key also known as an allen wrench to secure or remove it.
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.