Fine motor/threading TEACCH task for children with autism and in ABA therapy. Could work on sensory board, would just need to be careful of string length. If you like UX, design, or design thinking, check out theuxblog.com
schroefjes draaien voor de fijne motoriek
1:1 correspondence (fine motor and sensory component with placement of nail and pounding of hammer)
Teacher Tom's blog is stupendous!
Montessori 3-6 class: hex, slotted and graded bolt boards - Montessori Services $99.00/set A great activity for hand strength as well as concentration.