Otto Bilz [India] Private Ltd manufactures Over the Spindle Quick Change Chucks for Drilling. Otto Bilz [India] Private Ltd manufactures Chucks for Thread Cutting, High Precision Holding Systems for Tapping, Drilling and Reaming, CNC-Precision holding systems. The Over the Spindle Quick Change Chucks for Drilling can be fixed to the noses of machine spindles in conformity with DIN 55058. They are located on the spindle by means of a special screw which locks the chuck on to the spindle nose. This screw locates in a tapped hole in the spindle, and the inner sleeve of the chuck has six holes which accommodate the positional tolerance of the tapped hole in the spindle and ensure free of play positioning.