Features: Accuracy engineered with a strong aluminum frame and ABS locking side block, this stair measuring tool ensures accurate width fixation and 360 rotation for excellent template replication in stair installation projects. Featuring a revolutionary 360 rotating end and slide locks positioning rod , it adapts seamlessly to complex angles while preventing measurement slippage during transfers. designs for carpenter, construction workers, and DIY enthusiasts who demand professional accuracy for stair measurements and material cutting. Optimized for both hard job sites and home renovations, its weather resistant construction withstands outdoor conditions while maintaining measurement consistency. The included cloth storage bag ensures organized portability, complemented by durability that outperforms traditional wooden or plastic measuring tool. Specifications: Material: Aluminum + ABS Red rulers thickness 12mm Side rulers thickness 6mm small Bag: 615x75mm Expanded length: (without rulers width) 1565mm Full expansion length: (including rulers width) 1640mm Package Includes: 1 set Stair Measurement Tool note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the differences between different monitors, the picture may not reflect the actual colorful of the item.