Built with twin knuckle grips for guaranteed stability, the OffBox 36 Mega Brolly Arm from Preston will support even your largest brolly over your seatbox, keeping you warm and dry.The short but sturdy set of arms secure your brolly closely to you, which can then be adjusted by rotating the arms to make sure your nearby gear is dry as well.OffBox Mega Brolly ArmTwin grips for reinforced stabilityShort arm setRotate to adjustFits standard seatboxesInsert sizes: 30mm, 25mm, 23mm