They are difficult to install in plaster but doable. You will (obviously) need your own masonry drill bit. A puncher is highly recommended. The instructions say to drill 3/16" holes, which I think would pose a problem. I went with 1/4". Worked fine. The plastic dowels went in with no problem, but most of them did broke when applying the numbers. It doesn't bother me too much. I'd be very surprised if the numbers ever showed up. The metal spacers that "float" these numbers are silver. I took another reviewer's advice and painted them black before installation. Very glad I did. Plus they look great. Overall very satisfied.
Solar Powered Lighted House Address Numbers Sign, Waterproof π‘ Resin Plaque Outdoor Lights for Houses, Gardens, Streets, Yards, and Homes
9 Review
Solar Address Sign Lighted House Numbers Waterproof, Solar Powered LED Illuminated Address Plaques With Stakes, 3-Color In 1 Outdoor Address Number For Home Street Yard Driveway
12 Review
Black Wrought Iron House Number 3 - 3 Inch Size With Included Matching Screws For Easy Installation
13 Review
Waterproof Solar-Powered Address Sign With LED Illuminated House Numbers, 3 Lighting Modes, Wall Mounted And In-Ground Options For Outdoor Home Yard, Perfect For Search Engine Optimization
10 Review
Hemway Glitter Grout Tile Additive: Sand Gold Sparkle For Your Bathroom, Kitchen And Wet Room Tiles - Easy To Use And Temperature Resistant!
10 Review
Gorilla Waterproof Patch & Seal Liquid - Black 16Oz - Ultimate Solution For Quick Fixes (Pack Of 1)
39 Review
Eco-Friendly Solarez UV Cure Grain Filler & Sealer - Perfect For Fine Furniture, Guitars, Pool Cues And DIY Woodworking!
10 Review
Silver Holographic Stars Glitter Grout Tile Additive 100G - Easy To Use For Tiles, Bathroom, Wet Room & Kitchen
14 Review