2 Inch Floor Protecting Rubber Office Chair Caster Wheels Twin Wheel fit to Metric Screws M8 x 13 mm, China Standard Chairs Threaded Stem Brake Swivel Casters Contains 1 Easy Tools (Black & Gray)

These castors fit great. I used them on an adjustable stool for my apartment. 8mm thread fit the nuts I got off my old castors. 13mm length was the right length. The tool that was included to place on the fixed nut at the bottom of the thread worked nicely. Was able tighten the castors all the way. I used the old nuts off my old castors to tighten the castors in place. Castors were the right diameter and swivel very nicely. With my weight (195 lbs) on the stool it slides very smoothly across my wood floor with no scuffs. My old castors were single wheel. I have always thought double wheel castors were better and they are for this application. For $2.50 per castor can’t really go wrong. [...]