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.
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
Industrial Bigwheel Hangers Sliding Barn Door Kit - 6.6Ft Heavy Duty, 4-18FT Black Hardware, Smooth & Quiet Operation, Easy To Install (Fits 36"-40")
40 Review
Premium Replacement Keyed Patio Sliding Door Handle With Mortise Lock And Key Cylinder, Fits Doors 1.5 To 1.75 Inches Thick, Reversible Non-Handed Design, 3.94-Inch Screw Hole Spacing
40 Review
π¦ Gorilla Ultimate Waterproof Wood Glue 8 oz. - Natural, Versatile, Long-lasting Adhesive (1 Pack)
3 Review
Gorilla Micro Precise Super Glue: 5.5 Gram, Clear - Top Quality Adhesive (Pack of 1)
3 Review
Gorilla Epoxy Minute Ounce Syringe
6 Review
π¦ Gorilla Black Duct Tape, 1.88" x 12 yd, Black, (Pack of 2) - Versatile and Durable Adhesive Tape for Repairs and DIY Projects
7 Review