This high quality kit contains a set of four keys with pre-drilled holes on the Aluminum Pro-Bars. If additional adjustments or placement is necessary, drilling additional holes is accomplished using a 3/32” drill bit. Although keys are optional, it’s much easier and more efficient to use keys in the event the frame or the canvas require adjustment.
Due to their unique design and exceptional rigidity, BEST Corner Keys can be used on wood stretcher bars where necessary. To keep the frame corners square, it is suggested to use either a set square for very precise adjustment if needed. Alternatively, an object that is built with square corners can be used as a guide to adjust the squareness of the corners.
Constructed with the professional in mind, the keys are quality built and designed to last. Now have complete confidence that the canvas will remain at the desired tightness, while the frame will maintain its required shape without loosening or twisting.