Mistakeproof stem selection - includes 5 wheels and 10 stem fasteners (5 each 3/8"D x 1"L) (5 each 7/16"D x 7/8"L) for all metal-base chairs
Full hood design - 2"D oversized neck, weight rated 100lb. per wheel
Determine correct stem diameter by removing a caster from the leg of your chair base. Match diameter of existing stem and insert into caster body- Discard the other five fasteners
Comments about Office Star SPACE� Air Grid� Mesh and Leather Executive Mid-Back Chair with Headrest, Black:
The assembly was amazingly easy. Staples had all part numbers separated into their own packaging and labeled by number and step used (only 8 steps involved and the last two did not involve much). The chair is very comfortable. The headrest is too high but that is normal for my 5'3" frame.