Easy to Use: Simply place one end of the woodworking ruler into the gap, slide the woodworking ruler to fill the gap, and then tighten the knob to accurately read the gap length. Application: Suitable for many types of woodworking tools. Whether it's a table saw, bevel saw, cantilever saw, push saw, engraving table, or other slot cutting tools. Material: This engineering architectural drawing ruler is made of aluminum alloy material, no worry about the ruler getting oxidized and rusty. Function: This woodworking stripping gauge can accurately determine the size of joints without measuring. Practical: Gap gauge with great practicality, easy to use, flexible operation, woodworking enthusiasts, designers, engineers, architects, students, teachers deserve it.