Product description 

·  Designed for estimating board feet in a cut log

·  Graduated inches to 1/16ths lower edge

·  Outside markings for 10 and 18 ft logs

·  Inside markings for 12 ft, 14 ft and 16 ft logs

From the Manufacturer

Designed for estimating board feet in cut log. Marked outside for 10 and 18 foot logs, lower edge consecutive inches to 1/16ths. Marked outside for 12, 14 and 16 foot logs.