Personalized Work With Nuts Youth Long Sleeve T-Shirt. Structural engineers work with nuts text with and bolts,in smaller text below is a humorous gift design for structural engineers and college students at back to school, birthdays, holidays and graduation. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)