Hex Standoff - Male-Female #4-40 x 1/4 (OD) x 3/8 (Length) Steel, Zinc Trivalent Plating (QUANTITY: 300)

An opening with a partial internal thread at one end and an externally threaded post at the opposite end
It is used to hold two components at a given distance from each other.
Standoffs are usually chosen over spacers when longer sizes are required
Hex standoffs can be installed with a nutsetter or other wrenching device
Hex standoffs can be installed with a nutsetter or other wrenching device