Excellent quality and extremely easy to install. If you use the right drill. You will need a 5/8" bit. I installed two of these, one on a PVC door (I think) and the other on a metal door. Both doors were hollow insulated doors and both were about 1/8" on either side "" thick. I used a drill bit like the one below and it worked out fine, it took about 5 minutes for each door. It took about 1 minute to drill. . This is a wood drill bit so drilling wood shouldn't be a problem. The Peephole itself just screws in. Takes maybe 30 seconds. I did it by hand and tightened it up. Drill: https://www.amazon.com/Speedbor-88810-2000-Wood-Boring/dp/B00004YOA5/ref= sr_1_12?dchild=1&keywords=5%2F8%2Bdrill%2Bbit&qid=1615404033&sr=8-12&th=1
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