Machinist square with scale: an auxiliary tool for measuring and scribing at 90degree right angles and 45degree oblique angles; a useful woodworking carpenter square. Woodworking square: adjustable design makes it convenient for repeated scribing and marking; a practical woodworking square ruler. Multifunctional right angle ruler: the combination square can be used as a gauge for transferring measurements and for positioning squares in woodworking. Adjustable square for carpentry: this square has a well thought out design and is a reliable helper for carpenters; a versatile combination square. Use scenarios Marking and checking cabinet frames and furniture parts that require precise 90degree or 45degree angles. Transferring measurements from a ruler to workpieces for repeatable cuts in trim, shelving, or paneling. Aligning and laying out components during assembly by checking squareness against reference edges.