Starrett 579B-12 Telescoping Gage 1/2"-3/4" Range 12" Handle

The Starrett 579B-12 is a precision telescoping gage designed for accurately measuring inside diameters, bores, slots, and grooves. With a measuring range of 1/2" to 3/4" and a 12" extended handle, this gage provides excellent reach for deep bore measurements that would otherwise be difficult to access.

Telescoping gages work by locking the spring-loaded plungers at the measured dimension, then transferring that reading to a micrometer or caliper for an accurate inside measurement. The 579B-12 is built to Starrett's exacting tolerances, making it a trusted tool in machine shops, quality control departments, and precision manufacturing environments.

Key Features:

• Measuring Range: 1/2" to 3/4" (12.7 mm to 19.05 mm)
• Handle Length: 12" — ideal for reaching deep bores and recessed features
• Spring-loaded, lock-style plungers for reliable measurement transfer
• Knurled locking handle for secure, one-handed locking of the plungers at the measured size
• Hardened and precision-ground contact points for long-term accuracy and wear resistance
• Smooth satin chrome finish reduces glare and resists corrosion
• Designed for use with outside micrometers or digital calipers for final dimension reading

The Starrett 579B-12 telescoping gage is part of Starrett's legendary 579 series, a line of telescoping gages that has been a staple in precision measurement for decades. Whether used on the shop floor or in a metrology lab, this gage delivers the dependability and accuracy that Starrett is known for worldwide.