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4 Piece Unibit Set; The UnibitŒ step drill bit features as single radial concave flute design for smooth even cutting and virtually round holes. Ideal for drilling holes in steel copper brass aluminum and other thin materials. # 1/4" shanks # Hardened industrial grade high speed steel 4 piece set includes: # #1 Bit drills 13 holes: 1/8" to 1/2" in 1/8" steps # #2 Bit drills 6 holes: 13/16" to 1/2" in 1/16" steps # #3 Bit drills 9 holes: 1/4" to 3/4" in 1/16" steps PLUS : #1 bit with Titanium Nitride Coating WARNING: This product can expose you to chemicals which is [are] 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.