Invader Wet Mop Handle makes removing and replacing mopheads easy and efficient. Side gate allows mophead to easily slide on and off handle. Thumbwheel clamps the mop firmly in place. It should be used with 1″ (2.5 cm) headband mopheads and universal headband mopheads (sold separately). Large head of the frame is made of sturdy plastic. Handle is made of fiberglass.