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