Baldwin Solid Brass Full Mortise Hinges. Accurately machined for precise installation and smooth movement. Knuckles are milled to a clearance of .010" (.3mm) to eliminate friction wear. Special threaded tip design allows complete interchangeability of finials with all full mortise hinges. Stainless steel pin. Supplied with button tips, other decorative tips available at an additional cost. Non-Removable Pin, Plain Bearing, 4" x 4", Lifetime Satin Nickel finish.