Type F1 Boring Head: 1.Types F1-12 F1-18 F1-25 2.D(mm) 50 75 100 3.Dia of boring (mm) 10 ... -630 F1 Boring Head: Specification:HT TOOLS is a manufacturer and experienced trading company in the largest machine tool accessories ... production basis in China, we produce collets,collet chuck,tool holders, er spanner,er nut,pull stud,machine vise,fasteners ...