Do these fit chairs that have a spring clip under the base.

I think the spring clip you mention is part of the gas strut. On my chair both the top and bottom of the gas strut are slightly tapered and it is only the tapers that actually hold the chair seat and bottom section together. The replacement strut came with clear instructions advising use of a hammer to separate the old strut from both top and bottom parts of the chair. Once I knew this it only took me a couple of minutes to replace the old strut. Chair is like new now.

I have no idea what size to purchase. My office chair takes up to 17 st, would you be able to advise me on what size gas lift to buy?

How tall are you? I weigh about 13.5 stone and 5.9". With hindsight I would have fitted the 7" lift - not the 9" but I guess that's a matter of preference.The lift is certainly easy to fit - assuming the fitting size is universal. Just knock the existing lift out top and bottom - it needs two or three solid whacks - and fit the new lift. No need to take the fitting off the chair - which I did - not knowing any better at the time. Hope this helps - please feel free to come back.brok

I was wondering can you verify is this product is a class 4 cylinder? I'm looking it for a vertagear sl4000 chair.

This will take up to 160kg as stated, the grade 4 is rated at up to 250kg. It should fit, but is not as highly rated as a class 4 gas lift.

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⚡ Elevate your workspace with power and precision!

EASY INSTALLATION - Simple assembly lets you upgrade your chair in minutes and get back to work
PERFECT FIT PRECISION - Tapered 50mm base and 28mm seat diameters ensure flawless compatibility
SMOOTH HEIGHT ADJUSTMENT - 9-inch gas lift extends seamlessly to 15 inches for personalized comfort
BUILT TO ENDURE HEAVY USE - Supports up to 160kg for ultimate durability and peace of mind
SLEEK CONTEMPORARY DESIGN - Matte black finish complements any modern office aesthetic

The BiMi Heavy Duty Class 4 9" Gas Lift is a robust, certified office chair replacement part designed to support up to 160kg. Featuring a 9-inch casing that extends to 15 inches, it offers smooth height adjustment with tapered diameters (50mm base, 28mm seat) for perfect fitment. Finished in sleek black metal, it combines durability with contemporary style, making it an essential upgrade for any professional workspace.

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Colour	Black
Product Dimensions	5 x 23.5 x 23.01 cm; 1.02 kg
Is assembly required	Yes
Assembly type	Yes
Primary material	Metal
Type of wood	Metal
Style	Contemporary
Capacity	Medium (M)
Item shape	Irregular
Mattress comfort	Four-legged rocking
Care Instructions	Wipe Clean
Publisher code	SW5DH
Seat height	15 Inches
Shipping weight	1.02 Kilograms
Item Model Number	50166
Manufacturer	BiMi
Item model number	50166
ASIN	B004NLZU8E

BiMi Heavy Duty Class 4 Replacement Black 9" Gas Lift for an Office Chair

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