AUViolin, thank you for your question, and pointing out this discrepancy. These types of glides can be used on hardwood floors, BUT these glides are designed for INfrequently moved furniture. Being used on dining room chairs would not be recommended.
Charlie, thank you for your question. As stated at the top of the page, the Home Depot Sku is Internet #100073977. This item is not available in stores so that only sku that is available is the internet sku.
I measured about 3/4-13/16
Hammering these in is what they were made for. Consider the hardness of the wood though as hardwood could be harder to nail into. In that case consider drilling a hole first, at a smaller diameter than the nail and shorter than the length of the nail, so the nail tip will hold firm. This will let the glide go in easier and allow for tight fit.
Use a 1/16" bit. Any size larger and the glide will be loose in the hole. Use a smaller bit for outside use to allow for expansion and contraction.
Indoors, no. Had them for years and they came out with no rust. Hard plastic is still rough on floor finish.
This might be a good alternative. http://www.homedepot.com/p/Shepherd-1-in-Nail-On-Felt-Swivel-Glides-4-per-Pack-9938/100146468
They are okay to use on tile, wood and solid surface floors. Not really intended to be used on carpet as they do not work like furniture glides. Since these have a flat bottom, you might consider a rounded glide to use on carpet.
Yes, these are designed to prevent floor scratches.
1.08 for 4 pack