Amazon.com: Master Lock Steel Anchor, Wall/Floor Anchor Used with Cable or Chain, Best Used to Secure Bikes to a Fixed Point : Sports & Outdoors
Ground Anchor
Tie-off Anchors Tuf-Tug Products
Eyebolt Anchor - To be bolted or welded to structure - 1/2 in. x 1-3/8 in. mounting bolt - Built-in tie-off point - Stainless steel - 3M PROTECTA AN112A - iWantWorkwear
Attwood Standard Lift 'n Lock Anchor Control 13700-7 - The Home Depot