Features: - Keep your Eighteeth Curing Pen functioning at its best with these high-quality replacement parts. - The bottom cover ensures durability and proper protection for the internal components. Pack contains: - 1 x Top cap / housing cover – the round white piece with two brass contacts. - 1 x Bottom cap / base plate – the white piece with two cylindrical posts. - 1 x Contact insert / terminal block – the small black piece (holds or insulates the contacts). - 2 x Mounting screws.