DESCRIPTION:GALVANIZED CONCRETE NAILTH3010H: BWG9 x 25mm/ 1"TH3010I: BWG9 x 38mm / 1-1/2" TH3010J: BWG9 x 50mm / 2" TH3010K: BWG9 x 65mm / 2-1/2" TH3010L: BWG8 x 75mm / 3"TH3010M: BWG8 x 89mm / 3-1/2" TH3010N: BWG7 x 100mm / 4"