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Don't have a caliper or tape measure?
This template can't be as precise as a digital caliper but we've tested it on both round and D-shaped openings and it's pretty accurate. This template also serves as a visual aid when shopping in our online store. All of our shells are sold by 1/10" increments, so a 1.50-1.59" shell will have an opening at least 1.50" to just a smidgeon less than 1.60"