School Board Approved.

Single Rubberex Wheel made by 'Faultless'. Black wheels with bronze yokes
An excellent caster for pianos in churches and schools.

Faultless single wheel piano casters are equipped with double ball bearing raceways.

• Wheel Diameter: 2"
• Wheel Face Width: 7/8"
• Wheel Material: Soft Rubber
• Load Capacity ea: 80 lbs. (320 lbs total for Uprights)
• Height Without stem: 2-17/32"
• Stem Dimension: 7/16" Dia x 1-3/8" Long
• Double ball-bearing swivel.
• Supplied with CR-1 round pressed steel sockets. Wood ferrules included.
• 2-1/8" diameter, with 4 screw holes ( screw not included ) without lock notch
• 1-1/2" Stem Height 
• OD Of Stem 1/2"

All of our wheels are sold with their own sockets. You will be required to replace the entire wheel / socket assembly to ensure a proper fit.
You may be required to modify the existing hole in your piano to accommodate the new casters.
Unfortunately there is no reference manual to tell us what wheels would work in each of the over 12,000 pianos manufactured.