Durable nylon base The base is made of highquality nylon which is stronger and more stable than metal and plastic Loadbearing capacity up to 500lbs Durable nylon material provides a strong chair base Heavy duty Bottom plate Gaming office chair tilt mechanism mounting hole spacing 10x6 Turn the handwheel to tighten or loosen the rear tilt tension 49 stroke cylinder The gas lift cylinder Class 3 length is 278mm and the extension length is 403mm Stroke 125mm 49inch Smooth and quiet rolling casters This office caster has precision ball bearings to provide smooth and quiet movement and the steel structure is durable Universal size 1122mm Service If there is any problem with the gaming office chair base set we will solve it for you in time