Dorian Tool 20U-MCLNR-4 Neg. 80° Diamond Boring Bar is a diamond boring bar tooling item identified by model 20U-MCLNR-4 with a negative 80-degree geometry. It is used for internal boring operations in machining where diamond tooling provides the cutting action. The -80° specification denotes the tool’s diamond cutting angle within the 20U-MCLNR-4 configuration.
