Incredible design - this attachment fits so badly on the Bosch 4½" grinder (GWS 18v-45) that I hope the people who who designed him were fired. Bosch claims it fits this model of coffee grinder, but whoever signed it is a clown. Out of the box it's a dangerous fit - sloppy, imprecise and in danger of being ripped and destroyed by the blade. The GWS 18v-45 requires an additional collar on the grinder to further limit lateral movement. The only benefit is, that it can be modified to correct this invalid fit (GWS 18v-45). This requires the collar to be created by sawing two original holes on the mounting bracket (forms a slot) and a screw with spacers to attach to the mill ( instead of the handle) then you can get a perfect fit and It picks up dust well No wonder I'm buying another brand of power tools right now. Bosch is a dangerous console bug that reflects something invented by ignorant fools. Spoiled Bosch - find out.