MADE WITH S2 STEEL. URREA INDUSTRIAL GRADE POWER BITS ARE DESIGNED TO PROVIDE HIGH ENDURANCE AND EXCELLENT PERFORMANCE IN INDUSTRIAL APPLICATIONS DEMANDING THE HIGHEST QUALITY. DESIGNED TO WORK WITH POWER OR AIR TOOLS AND HAND TOOLS SUPPORTING MEDIUM TORQUES. INTERMEDIATE-HARDENING HEAT TREATMENT. WARNING: This product can expose you to chemicals including lead which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65warnings.ca.gov -