BUT BEWARE. Once the screw collar on the end of the plug is fitted with the split collet cable grab in place, it is designed not to come off. It has a ratchet mechanism designed to prevent it being unscrewed.
It can be unscrewed using some force. But this destroys the ratchet pawls on the inside of the screw cap.
What to say? This is the industry standard mains power connector for a reason. Good solid construction, easy to use, and locking to avoid accidental disconnection. The cosmetic design of this connector has changed recently (yellow release clip) but it is 100% compatible, and to my eyes even better built than before. Note that the grey connectors for taking power FROM a rack only - the equivalent of a male IEC connector on a cable.