JBO Thread Ring Gauge (GO) - Metric Coarse - Right Hand - 6g - M39 x 4 M&D this hand reamer supports precise

this hand reamer supports precise alignment and reliable material removal for high-accuracy jobs

Built for quality control and precision engineering

Left-hand spiral flute: promotes efficient chip formation and a predictable bore finish with controlled cutting direction

and steady performance from the first cut to the last

and finishing passes where edge quality matters

JBO Thread Ring Gauge (GO) - Metric Coarse - Right Hand - 6g - M39 x 4 M&D this hand reamer supports preciseIntroducing the JBO Thread Ring Gauge (GO) Metric Coarse Right Hand 6g M39 x 4. This Go style ring gauge is designed to quickly verify external thread diameters against the M39 x 4 coarse thread standard, helping quality teams and technicians confirm proper fit and reliable assemblies. Built from hardened steel, it delivers exceptional durability and wear resistance for daily use in workshops, manufacturing floors, and field service. Its precise