The square tube size adapter is crafted from durable plastic, offering excellent resistance to wear and tear. Its hollow design allows for easy insertion and a snug fit, making it great for use in structural tubing projects. This adapter ensures that square tubes of varying sizes can be connected efficiently, enhancing the stability and integrity of the overall structure. Features -Color:Black -Material:Plastic -Size:6.00X4.00X4.00cm/2.36X1.57X1.57in -Durable construction: crafted from durable plastic, this product offers exceptional durability and reliability for longterm use -Easy installation: the precise square tube reducer design ensures easy and easy installation and connection -Multifunctional: the hollow sleeve and liner sleeve design allow for versatile use in different scenarios and requirements -tube protection: offers effective protection and tool for tubes, helping to prolong their lifespan and maintain their functionality -Broad usage: suitable for various equipment and devices, making it a versatile accessory in construction, industrial, and other sectors Package list: 6pcs x square tube reducing sleeves