Exquisite craftsmanship: Professional use, providing extreme cutting accuracy, accurate scale, exquisite workmanship, high precision. Stable performance: This tool can be quickly gauging either the thickness of the material or inside dimension of a joint, the opposite end of the gaps gauge is perfectly set to the required size for the other half of the joint. Absolutely precisely: This woodworking gaps gauge can precisely determine the joint sizes without fussy measuring. Great practicability: Easy to use, flexible operation, woodworker enthusiasts, designers, engineers, architects, students, teachers deserve it. Premium quality: This engineering architectural drawing ruler is made of high quality metal material. Never rust. Professional level for the highest precision.