General description Stops tape measure from slipping off corners while measuring diagonals. The 90° measurement angle securely straddles any corner and rotates 360° to accommodate any rectangular object. Attaches easily to tape with a powerful rare-earth magnet. Made of durable plastic, it is ideal for assembling drawers to create perfectly square batches and is also great for cases, frames, and more. Technical specifications Slot for tape hook width: 29 mm (1-1/8")