Snow mat, has triangular cut iron nails for making holes with specific diameter, and brought together with carriage bolts, where carriage bolts are assembled with washers for increasing support point

摘要

The mat has triangular cut iron nails for making holes with diameter 6 mm, and brought together with carriage bolts (1-6). The carriage bolts are assembled with washers of 25 mm length and 8.4 mm width for increasing a support point. A flat iron has 20 mm ends that are bent at right angles and cut at 30 degrees. A spring ring is fastened to an underside of the flat iron by bolts (7-13).