NE 4521 Kit Includes: Qty. Description 4 Anchor 4 Metal Anchor Strap Lag Bolt 2" Hex Head Bolt Flat Washer Loc Nut Illustrated Plan washer metal strap | Instructions for Anchoring Activity Centers aN 1. Determine the final location of your activity center. 2. Place the Anchor-fl stakes adjacent to the base and near the Anchor-It corners of your activity center {at the bottom of the legs on stake swing sets} and twist the auger-style stakes into the ground until only the loop is exposed. 3.