HSK vacuum handle of Germany standard is DIN69873, has six species standard and specifications, that HSK-A, and HSK-B, and HSK-C, and HSK-D, and HSK-E and HSK-F, common of has three species: HSK-A (with within cold automatically for knife), and HSK-C (with within cold manual for knife) and HSK-E (with within cold automatically for knife, high-speed type). 7:24 of General handle is by handle of 7:24 Cone and machine spindle hole of 7:24 cone contact positioning connection of, In high-speed processing, is rigid and overlapping aspects of accuracy has limitations. HSK vacuum handle by handle of elastic deformation, not only handle of 1:10 Cone and machine spindle hole of 1:10 cone contact, and makes handle of flange disc surface and spindle surface also close contact, this double contact system in high-speed processing, and connection rigid and coincide precision Shang are is better than 7:24 of HSK handle has a, type, and b type, and c type, and d type, and e type, and f type, variety specifications, which often for processing center (automatically for knife) Shang of has a, type, and e type and f type.