1" diameter cable clamp commonly used to hold the wire harness wires on all makes of pinball machine games.
Reference:
03-7655-4 cable clamp holder 1/4" diameter 040-5000-03
03-7655-6 cable clamp holder 3/8" diameter
03-7655-8 cable clamp holder 1/2" diameter 040-5000-06
03-7655-12 cable clamp holder 3/4" diameter
03-7655-16 cable clamp holder 1" diameter 040-5000-16
03-7655-24 cable clamp holder 1-1/2" diameter
Sega/Stern #040-5000-09