●Ten piece set to serve fifteen different thread applications. ●The M27 x P1.0 is a left hand thread. ●The remaining sizes are right hand threads. ●M14xP1.5(R), M16xP1.5(R), M18xP1.5(R), ●M26xP1.0(R), M28xP1.0R), M25xP1.5(R), M22xP1.0(R), ●M28xP1.5(R), M19xP1.0(R), M26xP1.5(R), M22xP1.5(R), ●M27xP.1.25(R), M20xP1.0(R), M27xP1.0(L), M24xP1.0(R)