Safer than casters: Chair slides that turn office chairs with casters into stationary chairs (gaming chairs, desk chairs), prevent slipping and work more efficiently, provide a safer seat for those who have difficulty getting in and out of the chair when the chair rises from a table or desk Protect your floor: The bell glides replacement has hard plastic bottom can protect your soft floor better, and the package includes felt pads also can provide an extra protection on floor Dimension of insert stem: The standard 7/16 x 7/8 inch (11 x 22 mm) grip ring mounting stem to attach to most standard chair or stool bases, Suitable size can meet your needs. Not fit for Ikea chairs Bell glides size: These bell glides are 2 inch in bottom width and 1.57 inch overall glide height, similar to most small chair casters; The weight of each glide is 110 lbs, 5 pieces glides support 550 lbs in total Practical design: With solid nylon structural glides design, can handle more weight on most of desk chairs, workshop chairs or any other stools, etc., black color also can easy to match different chairs; The plastic bottom is not easy to slide Standard 7/16"" x 7/8"" (11mm x 22mm) grip ring mounting stem to attach to most standard chair or stool bases - Please measure yours before ordering Used to convert swivel office chair with casters to a stationary chair Heavy duty weight rated 110 lbs. per glide as a set of 5 supports 550 lbs. Product Details: ·Shipping Weight: 10.6 ounces ·Item Weight: 10.6 ounces ·Package Dimensions: 5.2 x 3.7 x 2 inches