Works, is weighty. Warped records can be difficult to place or remove, so it is precision machined. Aluminium won't rust, and if your turntable is Japanese then it especially should have "Nagaoka AD-653" (slash two) spinning on it. Keep your plastic adapter, but this looks professional and keeps 45's aligned. Simple, unbreakable, all it should be, and cheaper than a few records at the thrift shop. If you've ever touched the anti-skid dial playing a 45, be sure to have a round adapter like this.