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| The various parts of the combination square set can be removed and put back on the ruler with a screw or nut that secures them to the ruler. |
 | This is useful when you need to use one particular accessory. |
| This can be done because there are grooves on one side of the ruler to allow the accessories to slide in and out. |
| Sometimes the user may find that the combination squares set rule may have marks on both sides. |
| As a result, included sockets can come with lock nuts that can be rotated 180 degrees to allow the ruler to be rotated. |
| Inside the different heads there is a small device that attaches the head to the rule. |
| When the lock nut is tightened... |
| ... the device is also upside down. |
| This means that the rule can be used with the groove "on either side". |
