Multi Angle Measuring Ruler 12 fold Angle Measuring Rule Universal Opening Locator Angle Finder Tile Measurement Tool,Suitable for Carpentry, Architect, Gardening,Courtyard

Bought this for a job I had to do and it worked wonderfully only down side I could see is that the Knurled screw caps fall off really easy unless they are tight. I would recommend not over tightening them though just snug with your finger grip will keep the hold that it needs.