Large flat head, smooth shank, 10 ga, diamond point To determine correct nail length to use, add one inch to twice the thickness of slate Amount of nails per pound: 1-1/2″ : 150 per pound 1-3/4″ : 135 per pound 2″ : 115 per pound 2-1/2″ : 88 per pound 3″: 65 per pound
