Description It is a 4-bolt model pump and its body is made of high-quality cast iron, making it very strong and durable. It has an adjustable height range of 4.3inch. You can adjust the chair to the right height according to your needs. Its chassis is made of high-quality iron and can withstand 300kg/661.39lbs of weight, adding more security to your use. Key Features Height Adjustable: This is a 4-bolt pattern pump, which has an adjustable height range of 11cm/4.3inch. Ergonomic Design: This item has an ergonomically designed foot lever, which has the right position. You can easily adjust the height of the chair without having to bend over.