3pcs Aluminum alloy Precision Pocket Ruler Woodworking Positioning Scribing Gauge Carpenter Marking Ruler. Made by top Aluminum alloy quality and made by process. Highly accurate and precise measurement markings for consistent and reliable results. Provides a highly accurate measuring reference, along with a quick set-up to your t-track accessories. Material: Aluminum alloy, Size: 6", 8", 12", Quantity: 3pcs