| 摘要 |
The tool has at least two open rotary carrying grooves (3,8,13) on the free end of its fastening shaft (1,6,11). At least one locking groove (2,7,12) is provided between the rotary carrying grooves. At least one of the rotary carrying grooves has a further locking groove (4,9,14) having shoulder faces (4a,9a,14a) at each end of the shaft. At least one longitudinal groove (5,10,15) is provided open axially to the free end of the fastening shaft between the rotary carrying grooves and lying opposite the first locking groove's peripheral area. |
