FEELER GAUGE SET: Feeler gauges metric and imperial, 32 pieces blades straight feeler gauge and 16-piece blades offset valve bent feeler gauge. MEASURING RANGE: 32 blades metric and imperial tool measuring range is 0.0015 inch (0.04mm) to 0.035 inch (0.88 mm), 16 blades standard SAE and metric feeler gauge measuring range is 0.005 inch(0.127mm) to 0.020 inch ( 0.508 mm). 360-DEGREE SWIVEL DESIGN & EASY TO IDENTIFY: The 360-degree swivel design allows you to easily carry. you could disassembled it into a separate feeler gauge by removing the screw. Dual marked metric and imperial. each blade has sizes laser etched for easy identification. STAINLESS STEEL MATERIAL: Feeler gauges are made of stainless steel, heat processed with chrome finish, high strengt.