300mm Metal Combination Square With A Centre And Angle Finder Measures Height For Setting Up Of Blades Saw Blades Can Be Calibrated The Square Is Adjustable With A Level And A Metal Marking Gauge/Scriber Can Measure 45 And 90 Degree Angles The Ruler Is Marked In mm And Cm The Angle Finder Has A Build In Level And Can Measure Straight Edges As Well As Horizontal Levels The Centre Finder Is Used To Measure The Centre Of Circles Or Round Based Items And Can Also Be Used As A Depth Gauge