These Lisle torx bits are available as a 12 piece set, 9 piece set or available individually. The 12 piece set includes the T-10 through T-50, plus the T-47, T-55 and T-60 bits. The 9 piece set includes T-10 through T-50. T-10 through T-30 are 1/4" drive. T-40 through T-50 are 3/8". All Torx bits are made of heat-treated alloy steel and feature a 1 piece design. Sets also include a vinyl holder for easy storage.