Features and Benefits: Sold Individually; Mastercool O RING PKG OF 10 NS; Sold Individually; Zirconium Coating Reduces Wear For A Longer Tool Life Premium High Speed Steel Designed To Cut Through Thin Hard Metals 12 Step Cuts Holes From 3/16 To 7/8, 1/8 Step Depth 3/8 Shanks Fit All Popular Drills Step Drill Bits Are For Cutting Ferrous and Non-Ferrous Metals, Plastics and Wood Up To 1/8 Thick.; Its Double Flute Design Reduces Chatter and Deburrs Holes; Replacement Gaskets for R134a Charging Hose, 10 Pieces.