G Scale Snap & Glue Clamps. A set of 2 Large Scale magnetic set squares. Simply pull them apart, place them inside and outside your 90-degree corners and snap them into place. The snap and glue set squares will hold the two pieces of plastic together, allowing you to glue them at a right angle without further worry. After the adhesive has dried, simply remove the clamps.
These strong magnets will handle walls up to 7-8 mm thick.
