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4 Piece Quad Head Carbide Tipped Spear Point Drill Bit
Set. The Quad Head cutter is design to improve bit
durability and drilling speed. These precision bits will
produce clean and precise holes in all types of glass
and mirrors. Holes are drilled fast and accurately in
bottles, tile and ceramics. Set includes one each of
1/4",5/16",3/8",1/2" Bit.