Features: 1.Rafter Square Tool: This Rafter Square Tool Is Made Of Excellent Plastic Material With Clear Engraved Scales, Wear Resistance. The Fast Rafter Square Structure Ensure Longevity And Reliability Under Various Working Conditions. 2.Slider Adjustment: This Square Ruler Has Adjustable Locating Blocks, Providing Flexible Locating And Easy Disassembly. The Locating Hole Diameter Is 4.5Mm. It Is Recommended To Use A 3?4Mm Drill Bit For Accurate Hole Locating. 3.2 In 1 Function: This Woodworking Square Can Also Be Applied As Connector For Drilling, Increasing Convenience And Practicality. With 2 Sliders, The Position Of The Sliders Can Be Easily Adjusted According To The Depth Of The Board, Facilitating Accurate Drilling And Screw Insertion. 4.Seamless Base: Adopting A Seamless Solid Base Design, Ensuring Seamless Consistency Between The Base And The Ruler. The Glossy Appearance Ensures User Comfort And Durability, Preventing Hand Wear. 5.Versatile Use: This Right Angle Triangular Ruler Is A Multifunctional Tool Suitable For Accurate Measurement, Drilling Locating, And Marking. Widely Applicable For Woodworking Measurement And Layout, Meeting Various Project Needs. Specification Item Type: Rafter Square Material: Plastic Hole Diameter: Approx. 4.5Mm / 0.18In It Is Recommended To Use 3-4Mm Bit For Hole Locating