[Accurate Measuring]This stainless steel ruler offers a 0 to 30cm range for clear measuring tasks. Suitable for drawing marking alignment and daily measuring at home school or job sites. [Wrench Ruler Design]This 30cm steel ruler combines measuring and tightening in one tool. The wrench ruler design helps reduce extra tools during assembly and workshop tasks. [Material Structure]Made of stainless steel and basswood with an approximate thickness of 4mm 0.16in. The structure supports repeated use for measurement alignment and handling work. [Emergency Utility]This multifunctional steel ruler is designed for measurement and can also assist with self needs and glass breaking in emergency situations when required. [Wide Application]Suitable for students carpenters engineers and architects. This heavy duty ruler works well in classrooms offices studios workshops and home projects needing measuring support., Manufacturer: Pissente