Firmly lock the fuselage for stable installation, without affecting the positioning at the bottom of the fuselage; Effectively increase the height of about 30mm, protect the fuselage from dirt and scratches; Adopt quick releasing and folding, quick installation, convenient and practical. Stability and safe are upgraded, no need to remove when folding and storing the quadcopter, convenient and practical. Lightweighted and stable to carry the fuselage, hardly affecting quadcopter flighting;