YOU ARE BUYING A 4 PIECE ASSORTED GROUP OF 4 FLUTE STRAIGHT SHANK CORE DRILLS............... SIZES ARE 13/64"--9/32"--13/32"--27/64"............Prices in the Production Tool catalog are $16.00-$18.00-$23.00-$23.00, respectively, for a total of $80.00..............My price is $13.95 for the lot...........Like buying one and getting the rest for free.................!