Model: 466651. Part Number: 466651. These 12 flexible machinist rules feature 5R markings with 10ths and 100ths markings on one side and quick-reading 32nds and 64ths on the reverse side. A good, quality machinist rule is an indispensable tool used by machinists, woodworkers, architects, draftsman, scientists, students, DIYers and more.