Features Excellent Steel: This gauge block is made of excellent steel processed by good heat treatment, which is very strong and wear resistant, providing accurate measurements. Good Performance: This gauge block is characterized by high accuracy, low surface roughness, good friction and dimensional stability. 87PCS: This gauge block features 87 pieces of different sizes to meet your different measurement needs and ensure accurate measurements. Measurement Method: Measurement blocks are the highest accuracy benchmarks for broadcasting wavelengths converted to solid length dimensions, and rely on comparative measurements to transfer dimensional note skills to accurate gauges, measuring instruments and workpieces. Wide Application: This gauge block has a wide range of applications and is commonly used for volume measurement of objects, calibration of gauges, inspection of workpieces and machining and mounting references. 1. Excellent Steel: This gauge block is made of excellent steel processed by good heat treatment, which is very strong and wear resistant, providing accurate measurements. 2. Good Performance: This gauge block is characterized by high accuracy, low surface roughness, good friction and dimensional stability. 3. 87PCS: This gauge block features 87 pieces of different sizes to meet your different measurement needs and ensure accurate measurements. 4. Measurement Method: Measurement blocks are the highest accuracy benchmarks for broadcasting wavelengths converted to solid length dimensions, and rely on comparative measurements to transfer dimensional note skills to accurate gauges, measuring instruments and workpieces. 5. Wide Application: This gauge block has a wide range of applications and is commonly used for volume measurement of objects, calibration of gauges, inspection of workpieces and machining and mounting references. Spec: Item Type: Gauge Block Set Material: Steel Quantity: 87 How to Use: Use directly. packing list: 87 x Gauge Block 1 x Toolbox Package List 87 x Gauge Block 1 x Toolbox