The bolts are graded in diameter for a more difficult exercise. Five slotted bolts and stubby screwdriver. Designed by a Montessori teacher to aid the development of eye-hand coordination and teach a practical skill.
DIY Portable LEGO Kit with Free Printable Activity Cards. I like this for school, older kids can have activity cards to create planets/atoms/molecules/fractions, younger ones can practice fine motor skills.
Or instead of bugs you can add foam letters then puy the foam letters back in the foam mat Bugs in the Grass - sweet Spring-time activity to promote sorting, playing, matching, fine motor skill development and fun!