These heavy duty 12 inch J hook rebar stakes are used to secure the bottom of our deer fencing to the ground to prevent deer from crawling under the fence. We recommend the stakes be placed approximately every 5 feet along the bottom of your deer fence. These rebar ground stakes work well for rocky soils and unusually hard terrain. Our 12" rebar ground stakes s are 3/8 in. in diameter. These metal ground stakes are available in packs of 20.