The Clever Pots Plant Pot Wheels for 40/50cm Round Pots help move larger or heavier plants along your patio or across other hard surfaces with ease. The wheels contain holes to aid water overflow from the pot and come in a pack of four. They are installed through a fixing point at the base of your 40cm and 50cm Clever Pots Round Plant Pot (sold separately). Simply align the wheel with the space in the base of the pot and push the two vertical arms of the wheel through the fixing point, push until it clicks into place. These wheels are ideal for when you need to move your plants to sheltered areas in high heat or in preparation for winter, moving your plants to protect them from the cold or frost. They are hard-wearing plastic wheels made to last season after season. They are recyclable at the end of life (remove ball bearings first by carefully popping off the top of the wheel to release). Dimensions: D 9 x W 30 x H 20. Material: PP - Polypropylene.