Office Chair Parts Bottom Plate, Cylinder, Base, 5 Casters Complete Under Seat Kit. This office chair parts kit includes all parts you need under the seat. This Kit rated for load capacity of 350 pounds. This kit includes:
1 SP47 Seat Plate
1 GC-e4 Pneumatic Gas Cylinder
1 CB-P27 Base
5 CH-55 Casters
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I thought I would have to throw out my 400 dollar one year old leather chair, a present from my wife because the bottom plate was made of soft material and I could not find a new plate with a 4” x 7” hole pattern until I found eChairparts. Ten minutes out of the box the new bottom solved my frustrations at a reasonable price and improved the comfort and use of the chair far beyond its original condition. I thought My wife had been scammed by the original chair purchase. but we are very happy with the “new chair” made with the strong bottom.