Tx15 or Tx25 and hex shape Hanger bolts, Tx15 & Tx25, hex shape on the middle, with six-lobe. Made of Carbon Steel, Customi Tx15 or Tx25 and hex shape Hanger bolts .Made of Carbon Steel, Customized Designs are AcceptedMaterial: carbon steelPlatings: zinc, black, yellow or gray phosphate and H.D.GMachine: formingCustomized designs are accepted