Rancilio HSD-ROC-SD Rocky Espresso Coffee Grinder 50mm commercial grade grinding burrs Grinds directly into porta filter for simple operation Powerful 166-watt direct drive quiet operation motor. All units are tested prior packaging which might leave a small trace of coffee residue. Please refer the video under product images for overview Tinted hopper with a 0.65lb capacity. Please check the FAQ section under the Product Details Simple variable grinder adjustment control. For Trouble Shooting Steps refer on the page 32 in the user manual