Select options Galvalume Strip Miters For Half Round Gutter $5.00 – $8.00 We manufacture strip miters which duplicate the configuration of a corner. Strip miters are installed on the outside of the gutter and are approximately 3″ wide. Installation: 90° corner-cut each gutter length at 45° angles 45° corner-cut each gutter length at 22½° angles Your cuts do not need to be perfect, the strip miter allows for tolerance while maintaining a custom corner. An additional 12″ needs to be added to each piece of gutter used on an outside mitered corner. Inside miters do not require extra gutter. The miters are installed with 3/8″ stainless steel screws and soldered or sealed with sealant. We do not sell box miters. We believe the use of a strip miter eliminates extra seams while maintaining the strength of your corner.