Return of the sleeve because the dimensions didn't fit. The actual outside diameter of the socket neck is approximately 2-1/4" (not 2-3/8") as opposed to the dimensions shown in the picture. But I'm sure it will fit well if used in conjunction with the hole provided. The included drill hole is 2-3/8" OD which should perfectly match the 2-1/4" socket which has small ribs at the corners of the neck with an overall diameter of 2-3/8" returned a product as I needed a 2-3/8" collar for my specific application. The hole that comes with it seems to be of good quality and I'm sure the extra parts would come in handy. Compared to other bushings, the drill assembly seems more durable and really stands out. The drill hole teeth look well finished/finished compared to other drill bit sets that come packaged with the sleeve. To be clear, the case color is not white. The insides are white, but the top surface of the lid is painted "silver".