The jacobs NMTB 30 ER 16 tool holder has 45-mm projection, and is prebalanced to 20,000 RPM at G2.5 with 1/2-Inch W12 thread mount . The jacobs NMTB 30 ER 16 tool holder is used for milling, drilling and reaming and is suitable for CNC machines and machining centers with automatic tool changers. The jacobs NMTB 30 ER 16 tool holder features highly precise, accurate concentricity with T.I.R