The 4pc interior is divided into three separate compartments: grinder, sifter and container. It has razor sharp non-breakable shredding teeth. The sifter has a fine steel mesh screen while the outer shell includes ergonomically sound notches on the top and bottom for easy twisting. A revolutionary design allows for the removal of the fine steel mesh screen portion, making it easy to transfer your blend into the container chamber. The bottom/container portion of the grinder is .40 inches in depth and holds the sifter pick as well as catches any pollen that falls through the sifter screen. Sutra grinder is CNC machined, crafted from aircraft grade billet aluminum block, anodized for a smooth finish and etched along the sides for easy grip. A Teflon O-ring avoids metal on metal contact when using the 4 pc Sutra 50mm Grinder. The lid does not thread on or secure by any other method. All other compartments are screwed together for security. Allows for the option to remove the sifter compartment completely by simply pulling it out.