The required opening in your door is large enough. The advantage is that it collects and transmits light very well. The glass optics make it very visible (unlike cheap eyes with plastic lenses). The lens is 0.675 inch (17 mm) in diameter. On the inside is a hinged cover that blocks the viewer. Installation: I used a 1-1/8" Forstner bit. A 1-1/8" hole saw will also work. The 1.125" (1-1/8") diameter drill bit gives you little room to install a 1.10" diameter shaft. It's easier to install a 1.125" diameter hole than finding a 28mm (1.10") drill bit. If you want a really tight fit you can buy a 28mm bit (these are available online) Looks and feels high quality This is heavy Made in China.
ZEKOO Bypass Sliding Barn Door Hardware Kit For Double Doors, Single Track, Flat Track Roller, One-Piece Rail - Available In 4FT To 12FT Lengths, Perfect For Low Ceilings (6FT Single Track Bypass)
34 Review
π High-Quality Patio Sliding Glass Door Handle Set with 45Β° Mortise Lock - Fits Various Door Thickness, Screw Hole Spacing, & Reversible Design - Non-Handed, Black
33 Review
Ensure Ultimate Door Security With Door Reinforcement Lock β Child Safety 4 Screw Lock For Inward Swinging Doors
41 Review
ZEKOO 2.5-8FT Customized Style Interior Super Mini Sliding Barn Door Hardware Black Roller Rails Closet Cupboard Storage Cabinet Kit (2.5FT, Single Door Kit)
34 Review
32Oz Gorilla White Waterproof Patch & Seal Liquid For Effective Sealing (Single Pack)
30 Review
Eco-Friendly Solarez UV Cure Grain Filler & Sealer - Perfect For Fine Furniture, Guitars, Pool Cues And DIY Woodworking!
10 Review
Pack Of 1 Natural Wood Color 8 Ounce Bottle Gorilla Wood Glue
42 Review
π³ Efficient Drip-less Wood Glue Dispenser, 16 Oz Bottle
8 Review