Product descriptions from the supplier GB T 3903.1 Standard Compliance: Built to test the flexing function of shoes and shoe soles at room temperature according to GB T 3903.1, a widely used footwear flexing test method. Crack and Glue Failure Evaluation: Fixes the shoe or shoe sole on the machine and flexes it at a set angle and frequency, so operators can measure the length of cracks or glue failure and observe changes in the shoe upper. Adjustable Bending Angle: Bending