1/2 in. x 15 in. Earth Ground Anchor with 4" auger. 800 pounds product failure load. Pull-Out load will be lower and depend on soil type.
Earth Anchor Instructions
(View PDF English or Spanish)
Do-It-Yourself protection for most outdoor structures or possessions.
These instructions are for suggested attachment to small shed not located in high wind areas. For more detailed anchor requirements, see the wind zone charts for your area. You may need additional anchors, cable, wire clamps, or other forms of anchor attachments to the shed to meet local or state requirements.
Wind Zone II chart shows 12' x 18' building: