Red End® Extension Rulers
Graduated slide rule extends up to 6"Slide rule runs under friction in T-lot and stops at each end to prevent sliding from falling outX46X has two 6" extension slides: an extension is ready for use on the first sectionHX46 has hook zero falls at inside of hook, for distance measuringX46F has flat, inside markings: numbering begins on inside of ruleFor carpenters and other professional craftsmen