Starrett C9-12-4R Combination Set Graduations - 12-Inch 4R

The Starrett C9-12-4R is a professional-grade 12-inch combination set featuring 4R graduations, designed for precision layout, measuring, and inspection work in machine shops, fabrication, and general metalworking applications.

This combination set includes a hardened and tempered steel rule graduated in 4R format — reading in 1/8, 1/16, 1/32, and 1/64-inch increments on all four edges — paired with a combination square head, protractor head, and center head, giving the user maximum versatility on the bench or shop floor.

Key Features:

• 12-inch hardened steel blade with 4R graduations (1/8, 1/16, 1/32, and 1/64 inch)
• Combination square head for 90° and 45° angle layout and measurement
• Protractor head with level vial for angle measurement from 0° to 180°
• Center head for locating the center of round or square stock
• Precision-ground blade slides smoothly through each head and locks securely
• Spirit level in the square head for leveling applications
• Scriber included for layout work
• Manufactured in the USA to Starrett's exacting quality standards

The Starrett C9-12-4R is ideal for machinists, toolmakers, and quality control professionals who demand accuracy and durability. Starrett's combination sets are recognized worldwide as the benchmark for precision hand tools.