Omnia Omnia Solid Brass Ball Bearing Mortise Hinge 4 1/2" X 4 1/2" -heavy Duty .134 Gauge -for Doors With Higher Frequency Of Use Or Doors Equipped With Closers, A Ball Bearing Hinge Should Be Used Over Plain, Which Conform To Ansi A2112. -ball Bearing Hinges Feature Two Permanently Lubricated, Non-detachable, Hardened Chrome Alloy Ball Bearings. -designed For Installation On Doors Of Medium Weight. They May Be Used On Wood Or Hollow Metal Doors And Corresponding Frames. -button Tips Standard; Pairs Of Acorn, Ball, Crown, Steeple And Urn Finials Are Available Separately. -all Hinges Packed With Wood Screws. Machine Screws For Metal Doors And Frames Available As An Option. More info »