Description:  Signature Precision Square 300mm Guaranteed T Speed Measurements Ruler for Measuring and Marking Woodworking Carpenters Aluminum Alloy Framing Professional Carpentry Use.     Specification:  Product Name: L-Shaped Hole Ruler.  Material: Anodized Aluminum Alloy Structure.  Type: Metric 300mm/Imperial 12 Inch.  Color: Red+Black.  Thickness: 2mm.  Scale: Laser Front and Back Double Scale.  Degree: 90 Degree.  Squareness: 0.008mm.  Options:  Metric: 300mm.  Length: 300mm.  Hole Distance: 1mm.  Hole Diameter: 0.7mm.  Scale: Front and back scale.  Imperial 12 Inch:  Length: 12 Inch.  Hole Distance: 1/16 Inch.  Hole Diameter: 0.7mm.  Scale: Front and back scale.     Features:  【High Quality】 Made of Anodized Aluminum Alloy Structure, beautiful and durable to use.  【Mark Precisely】 Precision L square , make sure accurate woodworking measuring and marking.  【Easy-to-Read Thermal】 Both front and back include scale and hole, you can use both right and left hand.  【Stable yet lightweight】Including hole positioning design, handly weight, perfect and precision to marking.  【Both metric&imperial type】Draw straighter,more accurate parallel lines in less time than you can imagine.     Package Included:  1 x L-Shaped Hole Ruler