... Nail Material:45# steel Size:1"-4" Shank:smooth,longitudinal,twisted groove Color box Straight Shank K Type Head Concrete NailConcrete and ... "-4")Diameter: 1.6mm-5.5mmShank: smooth, longitudinal groove, twisted groove, angular spiralHead: headless,flat head,countersunk head,K type,T type ... ' requirement4.2×75mm4.2×100mm4.2×125mmStandard Size: 1"-4"1"x3.0mm 1.5"x3.2mm 2"x3.6mm 2.5"x4 ...