Check the listing for details. Piano Caster/Wheel Socket (Mounting Plate) 2 1/8" diameter, grip ring stem type. Condition: New. Listed at 6.99 USD. 1 piano caster/wheel mounting socket. Fits casters with a grip ring in the groove cut around the shaft - (see pic). These sockets are typically found on US made pianos fitted with rubber wheeled casters, either single or double wheels. Mounting plate is 2 1/8" diameter. Stem mounts in approx 9/16" hole. Bushing (just under 7/8" diameter) included in the event the existing hole is too large. It's very important for the stem to fit tightly in the leg to prevent damage to the socket once weight is put on it. Screws also included. I've been servicing pianos full time since I was 17 years old (30+ years) and in that time have serviced/replaced casters on hundreds of pianos - antique uprights, spinets, consoles, studios, square grands, baby grands and grands. I'm glad to answer questions about this product before or after the sale - my contact info is included in each shipment and you can also reach me through eBay.We combine shipping. Place all items you're interested in into your cart then checkout when finished - eBay will automatically calculate the best shipping rate/options.