This splits a large molex power connector (4-pin) that is commonly used for 5.25" devices such hard drives and CD/DVD drives into another large molex connector (4-pin) and a small drive connector (4-pin), used for 3.5" devices such as floppy drives.

This is very useful if you run out of connectors on your internal PSU.

Cable features three connectors: MALE 4-PIN MOLEX (for 5.25" devices) to FEMALE 4-PIN MOLEX (for 5.25" devices) and smaller 4-PIN FEMALE (for 3.5" devices).