A small adjustable square.
A double square, that has a cast iron body and an adjustable ruler.
Marking out: The double square is a very accurate tool that you can use to make precise marks for joinery on your already dressed and square timber.
Measuring: Using the ruler on the double square you can measure components or use the ruler to draw accurate marks along the edge of your piece. You can also use it to measure the height of a router bit or sawblade above the table.
The double square can be used on all timber, metal and acrylic products