The device is designed to determine the strength of the nail-on-board fastening of the sole of leather shoes at a temperature of (20 +15 -10 ) ° C according to GOST 9134-78. The maximum height of the fixed sample is 35 mm. The fixture is attached to the standard universal adapter of the testing machine in the stretch zone. Also, to carry out the test, a regular grip of the machine with inserts for fixing rectangular samples will be required. The device is allowed to be used with a load of up to 3 kN.