5/16" X 4-3/16" Expansion Concrete Wall Anchors Eyebolt Screw, Heavy Duty 304 Stainless Steel Shoulder Lag Eyebolts for Concrete Wall, 5 Pack workwarehouse seems you are using a

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5/16" X 4-3/16" Expansion Concrete Wall Anchors Eyebolt Screw, Heavy Duty 304 Stainless Steel Shoulder Lag Eyebolts for Concrete Wall, 5 Pack workwarehouse seems you are using a5 16" X 4 3 16" Expansion Concrete Wall Anchors Eyebolt Screw, Heavy Duty 304 Stainless Steel Shoulder Lag Eyebolts for Concrete Wall, 5 Pack Product Features Standard Size M8 * 106mm(5 16" X 4 3 16") expansion eyebolt, they can approximately hold 375lb 170KG weight. warm tips: please choose a 12 mm drill bit to drill hole. Premium Material Concrete wall hook made of 100% 304 stainless steel,smooth surface without burrs, durable and rustproof. Easy to