"Posting" is a great way to develop and strengthen a child's pincer grasp. Using a pincer grasp is an important in the development of mature fine motor skills.
"Posting" games can be easily made with containers you have at home and small items (I like pirate treasure). To make the activity easier make the hole larger, to make it harder make the hole smaller and see how fast your child can do the activity.
Of course watch for sharp edges, and supervise to make sure items are not places into mouth!