Type B: with hex nut, domed washer and threaded stud
Type S: with hex head screw and domed washer
Type SK: with countersunk headed screw
Grade 8.8 carbon steel, zinc plated and blue passivated
A4-80 stainless steel (Type B),
A4-70 stainless steel (Type S, SK)
Twin-cone heavy duty bolt with cylindrical expansion for increased anchoring security.