Part name;Unitary clamps(heavy duty clamp) Material: stailness steel, carbon steel Bandwith:From 18 to 26mm range:17 to 252 Part name;Unitary clamps(heavy duty clamp)Material: stailness steel 301,304,316 and carbon steelBandwith:From 18mm,20mm,22mm,24mm,26mmfastening range:from 17mm to 252mmScrew:Hex-head, Galvanized carbon steel. Unitary clamps(heavy duty clamp)