I have used this activity with both babies (dolly pegs), toddlers and with children on the autistic spectrum. It's a fairly popular activity and ties in a popular schemas that manifest in posting, starting off with the dolly pegs and eventually moving on to pinch pegs. You can obviously make the hole cut into the tin much smaller for individual needs, in fact I have a range of lids cut out so this can be used for various children with out the need of taking up storage space of more tins.
It is a particularly good activity in a TEACCH workstation format, as it so clearly shows the the activity is finished and is quite motivating with the loud bang as the peg drops into the tin. When I have used it in the workstation format I have usually velcroed the tin and box together, to make it one unit. I have also progressed to a lipped circular food storage container necessitating the need for the child to actually opening the peg to remove the peg (with the box it can can just be pulled off.