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Each fluted speedy tip is in proportion to the bit size, just like any other split tip metal drill bit, but with our design, your drill bits will last 4 times longer. Even on round, curved or uneven surfaces the stepped cutter bits will glide through metal without a pilot hole and drastically reduce walking. Individual drill bit part numbers follow this numbering sequence; KTIXD3107 is 1/16", KTIXD3108 is 5/64", KTIXD3109 is 3/32"...... KTIXD3133 is 15/32", KTIXD3134 is 31/64", KTIXD3135 is