This 4'' (10.16 cm) x 50'' (127cm) Pylex adjustable anchor screw is similiar to the link below.
https://www.rona.ca/en/product/pylex-4-in-x-4-in-x-50-in-black-steel-adjustable-anchor-screw-support-up-to-5000-lb-10555-12665003
Three of them asked for $30.
When you call please mention you found this ad listing on OKz.ca