110Pce Tap & Die Set UNF/UNC + Metric 70350 by Typhoon Tools FR356Z This is because they are

This is because they are designed to be used in power tools where in the majority of cases there is no facility to regulate the speed (SDS Plus

Angle: 55 Deg

Specifications: Spindle Speed Stainless Steel RPM: 332

Surface Drive ® on Box End Provides Off-Corner Loading for Better Grip and Reduced Fastener Rounding

2 pc removable three section plastic box with lid

110Pce Tap & Die Set UNF/UNC + Metric 70350 by Typhoon Tools FR356Z This is because they areFeatures 4 40 unc, 6 32 unc, 8 32 unc 10 24 unc, 10 32 unf, 12 24 unf 1 4" 32 unf, 1 4" 28 unf, 1 4" 24 unf 1 4" 32 unc, 5 16" 18 unc, 5 16" 24 unf , 3 8" 16 unc, 3 8" 24 unf, 7 16" 14 unc 7 16" 20 unf, 1 2" 13 unc, 1 2" 20 unf, 9 16" 12 unc, 9 16" 18 unf, 5 8" 11 unc 5 8" 18 unf, 3 4" 10 unc, 3 4" 16 unf m6 x 1. 0, m8 x 1. 25, m10 x 1. 5, m10 x 1. 0, m11 x 1. 5, m12 x 1. 25, m12 x 1. 75, m14 x 1. 25, m18 x 1. 5 1 8" 27 npt, 1 4" 18 npt