Designed for high volume operation coils contain large quantities of nails meaning that reloading down time can be kept to a minimum you will find them in the pallet and crate fencing garden furniture and the construction industries all coil nails are round head nails typically coils of nails with diameters from 20 mm to 22 mm contain 350 nails coils of nails with diameters from 25 mm to 31 mm contain 225 nails roofing nail coils contain 120 nails due to the extra large diameter of the head 15