We bought the Kodiak playset kit and got these to augment the 4 rocks that came with the kit.  However, these bolts are not long enough to go through the 5/4" deck boards and the rocks.  I should be able to find longer bolts but I don't see the length of the bolts anywhere in the description so there was no way I would have known.  The rocks themselves seem fine, it's just another trip to the hardware store...