These were frankly awful. While conceptually they should work, in my experience they don't get properly tightened and pressed against the back of the wall. Once in the wall, the screw in the dowel was tightened so that the arch rotated in the drywall as it was tightened. Wouldn't recommend it.
POWERTEC 4 Inch 20 2 Inch QTB1005 T Slot: A Revolutionary, High-Quality Power Tool Accessory!
8 Review
πͺ Strong and Versatile: National Hardware N222 406 Square Bolts for Secure Fastening
7 Review
π© 5-Pack of M8x60mm Stainless Steel External Hex Expansion Bolts by Yasorn
10 Review
Highly π Sought-After Fastener: Connector 014973445713
9 Review