What size Bit should you buy?

This is a quick, simple and accurate way to find the correct bit size.  One piece, made from durable plastic.  Insert like any bit, pull to one side until it reaches the built in "stop" and read the opposite side for your proper fit.  Measures from 3" to 8 1/4".  Can be used for big or small.  A must have for every tack room.  Made in the USA