In the 1950s the first vinyl-based Jukeboxes emerged allowing over 100 choices, including A and B sides. To allow the mechanism to switch to play a record from either side, a large arm was incorporated. A large arm meant a large hole.

These vinul 45 rpm singles had a hole the size of a silver half dollar to allow it to go over the new Jukebox's spindle. The 45 spacer bridged that gap, allowing 45s to be played on the same players as the regular long-playing albums.

Reference: http://www.opinionjournal.com/la/?id=110010079

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