High Quality Stainless Steel Laser Engraved Brake Lining Measurement Tool and Drum Wear Reference Guide Labeled in metric 1 mm increments 2 in 1 tool designed for vehicle maintenance inspection that assesses the remaining brake lining and drum wear reference guide, with no wheel or brake drum removal.Brake and drum wear inspection in minutes vs. hours. Reduces labor and material cost by eliminating guesswork in assessing remaining lining. Tool is approximately 6" long and measures in metric 1mm increments.