Deluxe Duet Noiseless Casters are perfect for when it is absolutely, positively needs to be quiet. Dual-grip ring technology eliminates excessive noise, providing quiet mobility. Duet twin-wheel casters complement all types of office & home-office furniture. The 2" diameter, dual, hooded wheels provide maximum mobility & smooth quiet rolling on light-to-medium duty applications. Hard wheel casters are designed for safe rolling on carpeted surfaces, preventing stress & strain to leg & back muscles. Stem fastener measures 7/16" diameter x 7/8" long. Each wheel is rated at 110 lb.