6 Inch Stainless Steel Adjustable Leg Levelers - Pack of 25 - Heavy Duty Furniture Leveling Feet for Tables, Chairs, Cabinets & Workbenches - Rustproof Leveling Hardware for Home, Office & Workshop Use

I used these for raising a couch 3-1/2 inches and they work very well for that use. The leg bottoms are smooth so they won't damage the carpet, and they are nicely finished. The overall minimum height is 6-1/8" including the mounting plate, and there is about +1 inch of extra adjustment if needed. If you use them on furniture check the present leg locations and make sure 1. they can be removed easily and 2. that you have at least a 3-1/2" square area of solid wood to mount the plate.