That would be snug, alright. You see, the 1078T is a 1" switch. Sentrol doesn't recommend a 15/16" bit or hole saw. If you ever used one of them you'd know that. Following is the product URL and the page from Sentrol's online catalog. Notice in the URL the phrase "id=1078T".
Description
The Sentrol Steel Door Terminal Contacts are designed specifically for use in the steel door commonly found in commercial building applications. The unique housing design features a rugged unibody construction with flexible ribbed sides for quick, secure installation without gluing. The magnet housing isolates the magnet from the surrounding steel for maximum gap distances, both make and break.
Features and Benefits
a.. Designed for use in steel doors b.. Drastically reduces installation time c.. Provides consistent connection d.. Easy to install e.. Terminals accept 14-22 gauge wire
Clearly you've almost no experience whatsoever.
Care to play again?
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Regards, Robert L Bass
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Bass Home Electronics 2291 Pine View Circle Sarasota · Florida · 34231 941-925-9747 Sales & Tech Support