Do it 50 lb. Hot-Dipped Galvanized Common NailFlat head. Diamond point. For general construction, carpentry, and framing. Most popular and versatile. Suitable for new treated lumber.No. 4HGC: Size: 4D, 1-1/2 IN, 12-1/2-gauge, head diameter: 1/4 INNo. 6HGC: Size: 6D, 2 IN, 12-1/2-gauge, head diameter: 17/64 INNo. 8HGC: Size: 8D, 2-1/2 IN, 10-1/2-gauge, head diameter: 9/32 INNo. 10HGC: Size: 10D, 3 IN, 9-gauge, head diameter: 5/16 INNo. 12HGC: Size: 12D, 3-1/4 IN, 9-gauge, head diameter: 5/16 INNo. 16HGC: Size: 16D, 3-1/2 IN, 8-gauge, head diameter: 11/32 INNo. 20HGC: Size: 20D, 4 IN, 6-gauge, head diameter: 13/32 INNo. 30HGC: Size: 30D, 4-1/2 IN, 5-gauge, head diameter: 7/16 INNo. 40HGC: Size: 40D, 5 IN, 4-gauge, head diameter: 15/32 INNo. 60HGC: Size: 60D, 6 IN, 2-gauge, head diameter: 17/32 IN