Pilot Diameter Chart
Copyright 2019, Fred Zeglin, reprinted by permission of the author.



These Charts come from Fred’s book, “Gunsmith Tools, Cutters, & Gauges – A Primer“.
There is so much more in the book, check it out!

Copyright 2019, Fred Zeglin, reprinted by permission of the author.



These Charts come from Fred’s book, “Gunsmith Tools, Cutters, & Gauges – A Primer“.
There is so much more in the book, check it out!

Updating this post from 2017: We now have over 2100 reamers and are still adding more tools all the time. Thanks for your continued business! ********************************* As of October 2017 4D Reamer Rentals LTD now has over 1100 reamers to serve your gunsmith rental needs. It’s pretty exciting how much this company has grown over the…
We often have clients ask about roughing reamers. We have never carried them because that would more than double our inventory costs and would not come close to paying for the expense. In 2025 Forster started offering a new batch of tools, “Piloted Roughing Drills”. They are offered in three (3) pilot size ranges. The…
4D has a proven method for shipping tools safely to the client. We use padded envelopes in addition to the mailer when we ship orders to clients. None of the shipping providers are gentle with packages. So, this ensures the tools make the trip all the way to the intended destination. It is super rare…
Stuart Otteson wrote two books about “The Bolt Action”, this is Volume I They are considered to be the go-to books for people who want the facts about modern bolt actions. Not only how they work but all the important engineering details. Stuart is a Mechanical Engineer by trade and he analyzed each action in…
We at 4D Reamer Rentals LTD have long had requests for some kind of protection policy against the cost of broken, damaged or lost tools. Our clients are responsible people who understand that under the Rental Agreement they have reasonable obligations. This protection plan is one way to handle that obligation. There are a lot…
Serman L. Mays a stock maker with more than 40 years of hands on experience making, finishing and checkering stocks decided a few years back to write a couple of books to help noobs (New Bees) get started in the trade with fewer mistakes and faster success. His book on stock making is one result…
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