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.