The SunStone Orifice Drill Bit #50 is for Natural Gas, the drill bit's number and sizes have an inverse relationship, which means the larger the drill bit number is, the smaller the drill bit hole will be.
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WARNING for California residents: this product may contain chemical(s) classified by the state of California to cause birth defects, cancer, or other reproductive harm. For More Information visit www.p65warnings.ca.gov