The perforating tool semi-square has 10 needles of which the 3 outer needles are slightly longer. Using this perforating tool you can not only perforate a semi-square but complete squares as well. Two opposing semi-squares together form a complete square.
The perforating tool semi-square has 10 needles of which the 3 outer needles are slightly longer. Using this perforating tool you can not only perforate a semi-square but complete squares as well. Two opposing semi-squares t...
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