This ball corner is used on case bottoms to allow for multiple unit stacking.The design has an indentation allowing for centering of a case stacked above it and for greater floor stability..Chrome Plated 14 Gauge Steel Ball Corner To Protect From Impact During TravelComes W/Heavy Duty Three-Prong Six-Rivet Anchor, Two Rivets Per Leaf fasteners not included Helps Provide Protection Against The Most Severe Transit AbuseThis Bracket Will Take the Deejay LED Aluminum Pop Rivet model: TBH5X18MMRIVET Uses 6Three Leaf System with Approximately 3-in Length Per Leaf and 1-5/8-in Leaf Maximum WidthApproximately 3/4-in Dimple Diameter1-3/4-in Approximate Ball DiameterShipping Box Dimensions: 6-in x 9-in x 3-inProduct Shipping Weight: 1 lbsProduct Unpackaged Weight: 0.2 lbs