Yes it's true, a transparent lampholder.  Works well with transparent cable.  This lampholder has a threaded skirt, so if you did want to attach a shade (transparent I presume), you can.

Important to note this lampholder clamps onto a cable.  It cannot be used on table lamps or chandeliers.

Before starting any electrical work, always switch off at the mains.  If in doubt consult a competent electrician