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 What is a mitre box?

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Wonkee Donkee Wooden Mitre Box used to cut precise 45 and 90° angles A mitre box is a tool that is used with a saw to enable you to make precision angled cuts (typically 22.5 degrees, 90 degrees and 45 degrees). Mitre boxes range in size from 12.7mm long by 51mm wide (0.5″ x 2″) to 325mm long by 180mm wide (12.5″ x 7″).
Wonkee Donkee Mitre box and saw for producing 45 and 90° angles on skirtings and coving Mitre boxes are used with handsaws, typically tenon or dovetail saws, and are used as a guide for cutting straight or mitred joints.See Which types of saw can a mitre box or mitre block be used with?
Wonkee Donkee Mitre boxes come in a variety of guises Mitre boxes come in a variety of guises and with a range of features from simple wooden mitre boxes to specialist ones such as the magic mitre box.
Wonkee Donkee Mitre joint on a picture frame made using a mitre box A mitre joint is a joint made by cutting two workpieces at specific angles and then joining the two pieces together. The result is a joint that fits together to form a specific angle.Typical 45 degree mitre joints are used on picture frames, skirting boards, and coving to create a neat 90 degree corner.
Wonkee Donkee Mitre boxes can be used with a variety of saws to cut most metals plastic and wood Mitre boxes can be made from wood (traditionally beech), plastic or even metal.See What are mitre boxes and mitre blocks made of?

They can be used with a variety of saws to cut almost any material including wood, metal and plastic.