Fast 2K, 12.4 Fluid oz, fence post back fill bag, expands to set posts in minutes, no wide holes required as with concrete, same technology used to set utility poles, no water or hardware required, waterproof, helps to protect the post, can be used during winter, ideal for fence & Gate posts, mailboxes, signs, clotheslines, garden light posts, Gooseneck stands, bollards, Flag poles, sports posts & poles, & much more.