DHC is a state of the art Korean manufacturer for work holding of swiss type / sliding head machines like Citizen , Tsugami , Toronos Hanwah , Star and Nextrun , they manufacture , main spindle collet , sub spindle collet , guide bush and feed finger chuck along with sleeve and toggle , special collets to can be made as per drawing and deliveries are very fast , collets with internal grooves , with sealing can also be made as per customers request