The holes are too small - they barely fit a #8 screw, something bigger (including the walldog screw) needs to be drilled out. "Knockout" does absolutely nothing, it just slightly etches the surface. Otherwise if you need a small hole or are willing to take the time to drill and deburr all the holes to save a few bucks these are good hooks and the cheapest I've found. Aside from the smaller opening, they look identical to the hooks that come with the Walldog, but they don't specify a weight capacity, so use them with heavier items at your own risk.
Heavy Duty Steel Picture and Mirror Hanger - Adjustable from 2-7/8 to 3-11/16 Inches - Pack of 2 - Prime-Line U 9131
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Command PH048-3NA Jumbo Universal Frame Hanger, 8 lb Capacity, Damage-Free Decorating, Easy-Open Packaging, Silver, Pack of 3 Hangers
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BigTeddy 4-Inch French Cleat Picture Hangers Kit - Aluminum Z Bar Clips for Hanging Mirrors, Photos, Shelves, and Cabinets (4 Sets)
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Pack of 50 Stainless Steel Picture Hanging Hooks - No Tools Required, Holds Up to 100lbs - Ideal for Hanging Pictures, Mirrors, Frames, Clocks, Shelves, or Planters - Perfect for Home and Office Wall Decor
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3Mm X 220Yd Macrame Cord - 100% Natural Cotton Rope For Handmade Plant Hanger Crafts
32 Review
Nokian Tires Nordman 7 205/55 R16 94T winter
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Organize Your Space With Storex Small Book Bin 6-Pack In Blue For Home, Office & Classroom Use
35 Review
Sowder Natural Goose Feathers Clothing Accessories Pack Of 50 (Gold Dipped White)
33 Review