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A curved instrument or handle of iron or wood, for holding and turning bits, etc.; a bitstock.

When a bitstock is used, instead of being given a true rotary motion the chuck is merely oscillated through the greater part of the circle and back again.

From these plates can be seen the progression of the bitstock toward its ultimate perfection in the late 19th century.

A tool for boring, of various forms and sizes, usually turned by means of a brace or bitstock.

Only sufficient pressure is given to the bitstock to overcome the uplift of the spring and to insure that the valve will be held against the seat.