12 RODAC star impact sockets in 1/4", 3/8" and 1/2" sockets, housed in a blue hard plastic case with engraved measurements for easy searching at a glance. Made of high strength chrome vanadium steel, these bits are suitable for use with impact drivers and are corrosion resistant. 1/4" socket: TP8, TP10, TP15, TP20, TP25, TP27 & TP30 ; 3/8" socket: TP40, TP45, TP50 & TP55 ; 1/2" socket: TP60