Fits into a 5/16" x 7/8" Inside Diameter
Features:
•    Quick and easy press-fit installation that maintains fit over long periods of time
•    Our SuperFelt® has been designed specifically for long life and is impervious to water, oil and most chemicals
•    Eliminates noise from sliding chairs
•    Keeps floors clear from scratching or marring and damaging floor surfaces
•    Thick square base for long wear
•    Ideal for non-skid applications
•    Polished finish design
•    Resists cutting and splitting from sharp tubing ends
•    Tube inserts prevent dirt and dust ingress
•    An economical and attractive way of finishing the end of a metal rod or chair leg tube
PLEASE MEASURE INSIDE AND OUTSIDE DIAMETER EXACTLY
Specifications:
•    Material: Polyethylene  (HDPE) with SuperFelt® Bottom
•    Color:  Black
Not sure about how to measure your chair caps? 
Please use this handy guide for measurement or call our help desk.