Processing Range: .4" - 10" (10-240mm). Dial Reading: .01mm. Rigid construction: Finest materials and craftsmanship are employed to combine strength, flexibility and accuracy in a tool of unique design. 2 vertical boring tool holes: one centered and one offset. One cross hole for greater versatility and capacity. Dependable adjustment: far spread graduations for closer reading. Perfectly balanced for high speed operation. Precision ground and hardened integral shank for rigidity and smooth operation. / Set includes boring head, fitted case, and an assortment of boring bars and holders to permit a great variety of machining operations.