Product Description A set of gauge blocks, also known as gauge slips, made from high quality stress relieved and hardened alloy steel. Each gauge block is marked with a traceable serial number. The gauge blocks are housed in a tailor made fitted protective case with sizes clearly labelled. Key Features - High quality hardened steel for durable life - Available in 4 grades: Grade K for Calibration, Grade 0 for Calibration, Grade 1 for Inspection, Grade 2 for workshop - High quality surface finish and high dimensional stability - Working surface hardness greater than 63HRC - Heat treated for high resistance to wear - Conforms to ISO standards for guaranteed accuracy and reliability - Supplied in a tailor made fitted wooden box/case Specification -Imperial Steel Gauge Block Set -E81, Grade 1 (Inspection Grade) , Comply with Standard: BS EN ISO 3650 -Contains 81 Pieces of Small Blocks -Composition (inch) : -0.1001 - 0.1009 (0.0001 increments, 9 pcs) -0.101 - 0.149 (0.001 increments, 49