Hinge #3, 14 gauge heavy duty, plain steel finish. Used on the upper-middle sections of the door, typically between sections 3 and 4. Bigger offset than the #1 and #2 to keep the rollers tracking correctly as the door transitions from vertical to horizontal. When your existing hinge is rusted or cracked, just match the stamped number. These heavy duty 14 gauge hinges can take more abuse than the standard ones, which matters on wider or heavier doors where each hinge carries more load.