This is a tilt control base, made of high-grade and sturdy iron material, practical and . It has a reasonable design and practical functions. The Office Chair Base can be easily replaced and brings you a better lifting adjustment function. Chair Swivel Base is made with excellent technology, will not be easily damaged or deformed, and can be for a long time. Features -Color:Black -Material:Iron - Size: 23.00X15.00X5.50cm/9.04X5.89X2.16in - Screw distance：14*17.5 - Manufactured with premium and sturdy material, which let you use for a very long time. - Rotating design and smooth surface, and this Chair Swivel Base is easy to install and use. - Thick and high-grade iron material and fine workmanship, and this Chair Swivel Base is heavy duty. - This Office Chair Base is suitable for most executive office chairs, task chair, office chair, rolling stool, drafting stool. - Easy to install, you just need to take out the old Chair Swivel Base and replace it with a new one. Package list: 1 x Office Chair Base