Key Features: Adjustable Height: This is a 4-bolt pump with a height adjustable range of 4.3 inches. You can install it on a chair and adjust it to the appropriate height as needed, which is very practical. Selected Materials: The pump body is made of cast iron, combined with a spray-painted plastic casing, you don't have to worry about it deforming during use, resulting in a longer service life. High Bearing: It can withstand a weight of 440 pounds, letting you rest assured to place a chair on it, and also make people sit at ease. Ergonomic Design: Its design conforms to ergonomics, so you only need to step on the lever to raise or lower the chair. Easy to Install: You only need to install the lever and plastic cover, and then install the entire lifting pump on the chair you want to lift. Application: This chair hydraulic pump is suitable as a replacement part for most standard-style chairs with four-hole and diagonal hole spacing of 4.53in bases in bars, beauty salon, hair salons, and other places. Specifications: Model: YL700 Material: Cast Iron, Plastic Color: Silvery Style: Modern Thread: M8 Surface Treatment: Painting Assembly Required: Yes Adjustable Range: 11cm/4.3in Maximum Load Capacity: 200kg/440lbs Suitable Base Diagonal Hole Spacing: 115mm/4.53in Gross Weight: 8.05kg/17.74lbs Net Weight: 7.15kg/15.76lbs Shaft Diameter: 26mm/1in Base Diameter: 89mm/3.5in Base Height: 57mm/2.24in Lever Length: 28.5cm/11.22in Product Height: 37cm/14.56in Package Size: 41.5*37*19.5cm/16.33*14.56*7.67in Package Included: 1*Chair Hydraulic Pump All Accessories for Assembly Notes: 1.Please note this package only contains the chair hydraulic pump, please prepare other components yourself. 2.It is recommended to clean with a dry tissue. Please be careful not to use detergent to wipe the surface of the product to avoid damage. Please allow the slight color difference caused by the shooting light and 1-3cm error due to manual measurement, and make sure you do not mind before you order.