Maze Metal Herb Grinder with Window, 4 part (2.7 x 2.5 inch)

Durable Electric Grinder Hand Held Type For Herb (1.6 x 5.75 inch)

Black Leaf Masher 4-part Aluminum Grinder, 2.5 Inch

Clear View Weed Grinder 4-layer Windows 2.5'' 63mm Zinc Alloy Metal Tobacco Grinder - China Wholesale Clear View Weed Grinder ,2.5'' 63mm 4-layer $4.76 from Ruian Lanchuang Smoking Accessories Factory

4-Part Grinders

4-Part Grinders

Tornado Metal Herb Grinder with Window, 4 part (2.8 x 2.5 inch)

Durable Electric Grinder Hand Held Type For Herb (1.6 x 5.75 inch)

Grinder, 4-Piece 3-Level 2.5 w/ Olympus Window, by Chromium Crusher – BKRY Inc.

54mm Zinc 4 stage Herb Grinder & Side Window Grinder

4 Layer Herb Grinder Viewing Window