Preston Offbox 36 Monster Eva Mega Bait Station, Zipped EVA square bowl with rigid hoop. The OffBox Pro knuckle can be attached to both seatbox and platform legs and once in position can be swivelled to the correct position. Can also be used without the bait tubs as a large groundbait bowl. Inserts Included 30mm Round, 25mm Round, 23mm OffBox.