Jig

File:DowellingJIgs.png

A Jig is a specially made piece of equipment used to guide another tool .

A drilling jig for example can be used accurately to position holes as they are drilled into a work-piece (a Dowel Jig).

A sawing jig may be used to guide a saw or to enable pieces of material to be sawn to a standard length without the need for repeated marking out.