These are a pair of Carbon Brushes ONLY WITHOUT Metal Casing you will need to keep your old casing for Wilks USA RX45i pressure washer fits a MH929 Motor Please do not purchase until you have CARFEULLY measured your own brushes and studied the images provided on the listing Carbon Size: 12.9 x 7.2 W x D (-/+0.1-0.3mm) please allow for small tolerances 1 Pair.