Northern Tool offers the Titan 25-Piece Standard/Metric Hex Key Set, model no. 12712, for $7. Opt for in-store pickup to dodge the $6.49 shipping charge. That's tied with our mention from two week ago and the lowest price we could find now by $6. It includes 12 SAE sizes from 1/16" to 3/8" and 13 metric sizes from 1.27mm to 10mm.