Duplex nails are commonly used to __ A. fasten metal or wood to concrete B. secure concrete form and scaffold members C. install drywall panels D. install window and door casings

B. secure concrete form and scaffold members<br /><br />Duplex nails are designed with a double head, which makes them easy to remove. This feature is particularly useful for temporary structures like concrete forms and scaffolding, where the nails need to be removed after the structure is no longer needed.