The SharpStone Clear Top 4 Piece Large 2.5" Herb/Spice Grinder in Gunmedal is a high-quality, authentic product made from aircraft grade aluminum by Sharpstone. This grinder features a 4 piece design with a clear top, making it easy to grind herbs and spices with precision. With a size of 2.5 inches, this grinder is perfect for efficiently crushing and preserving the aroma of your favorite herbs and spices. Designed and manufactured in the United States, this grinder is a reliable and durable tool for any collector or frequent grinder user.