I needed sockets for a control board project I'm working on so I ordered 10 pieces. Installation was easy. I had 1" grommets so I drilled 1" holes. When drilling a hole, be sure to keep the drill/backsaw straight. If you tilt it, the hole will be free. Part of the socket solves this problem painting - they can be painted, if they are bumped, bumped or wires move along them, for example on a table, you must first prime them. If you paint them without a primer, even when using plastic paints, the paint may chip. larger project or you need parts, a pack of 20 is only $0.84 per bushing, saving you some money.