WHOLESALE High carbon steel blade for maximum blade extension. Reads to 1/16 inch inch graduations. Long-lasting stainless steel spring for smooth operation. Sliding thumb lock and quick auto return. Sliding hook for inside and outside measurements. High-impact ABS case.Illinois Industrial Tools ⚠ WARNING: This product can expose you to DEHP, which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.