FIELD: eaves gutters. SUBSTANCE: proposed fastening device has opposite ends, longitudinal axis, threaded and plain parts arranged coaxially relative to said longitudinal axis. Threaded part is screw groove on outer surface of fastening device in radius. Fastening device has great number of facets located sequentially inside screw groove. Said facets are capable of reducing torque required for turning gutter fastening device into object to be fastened. According to other design version, fastening device has opposite ends, longitudinal axis, outer surface forming first radial distance from longitudinal axis and threaded and plain parts located coaxially relative to said longitudinal axis. Said threaded part is screw groove found on outer surface of fastening device and it forms second radial distance equal to radial distance from longitudinal axis to lowest point of screw groove. Fastening device has great number of facets located inside screw groove and having sections of different length and apices located at different radial distance from each other and form longitudinal axis. EFFECT: provision of reliable connection, no necessity of drilling holes in cant strip. 16 cl 13 dwg
