The BONNET-LOK™ System is a brush/bonnet combination in a single unit. The exclusive design allows both the brush and the bonnet to extend to the wall for maximum coverage and effectiveness. (circular design option) Uses a 16" bonnet in the middle. Also marketed under dirt napper , GBR19DBNLOK2 SKU 615129851190 Includes the following clutch, riser, driver, and one bonnet. Factory Installed Malish: Universal Clutch Plate :