Drill chuck specially knurled. Stainless steel. Self-tightening. STD ISO 239. UNF.
Built for the most precise bores. The ergonomic self-tightening system allows for a
very simple and quick operation. A clamping key is not necessary. Subtly knurled surfaces,
electropolished. Round edges. All parts hardened for a max. chuck life. Ducts and all contact
surfaces are ground. Checking for functioning and precision is done in accordance with
standard ISO 10888. Through hole. Permanent markings, stamped. For clock-wise rotation.