Made for Jars: Our coffee grinder lids are specifically designed to fit regular mouth jars . Transform your jar into a manual coffee grinder within seconds. jars are Not included. Premium Manual Coffee Grinder: Grind coffee straight into the jar that you plan to store it in. Ceramic burr preserves the aroma and flavor of coffee beans. Enjoy the fun of manual coffee grinding! For Anyone Who Loves Coffee and Jars: Our lid is great for camping, traveling, or power outages. Grinder lid turns any jar into a portable coffee mill. Adjust Grinding Size: Remove the gold nut, the handle, and the round piece beneath it, then screw the gear-shaped piece up or down the threaded rod to move the grinder pieces closer or farther apart. Simple to Clean: by grinding uncooked white rice to remove residuals and odors. Coffee grinder can be easily disassembled for a thorough cleaning. Rust Proof. Applicable tank diameter:70mm Color:Silver Material:stainless steel Package Contents: 1 * Coffee Grinder Lid Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.