Generally, you can use Drywall Anchors on any kind of wood no matter what the stud spacing. If the wood is soft enough for you to drill into, you can usually use a drywall anchor. If it's a strong, thick piece of wood, you may need to either drill a larger hole for your anchor or use a screw with a hook on the end. TIP: I recommend using Self Drilling Metal Anchors. They are much stronger and get penetrate wood with ease.