Slotted Body Square Marking Ruler with Perpendicular Block and Locking Knob

This square marking ruler is designed for layout work, combining a slotted body with a perpendicular block for accurate position setting on workpieces. It helps you draw and measure straight reference lines, making it easier to transfer dimensions and keep cuts or marks aligned. The central round locking knob turns it into an adjustable square ruler, letting you set and secure the block position for different marking needs. Made as an aluminum marking ruler with crimson anodized finish, it offers a rigid metal body and engraved measurement markings for clear reading. As a square marking ruler for workshop and woodworking tasks, it supports accurate layout work, helping create cleaner, more consistent marks on material surfaces.