RTS Home Accents Rock Lock 3-Piece End Rock Set with 18-Inch Spike Look and feel of real stone; End rocks give a finished look to the corners of your design Easy to assemble; Endless layout possibilities Suitable all year round and will not crack or chip in any weather Includes 3 end rocks and (1) 18-inch spike; Use with RTS Rock Lock Border System (sold separately) Extends your growing season as the hollow walls insulate the soil and plants