Head with 2 serrated blades. For tall and thick grass (delivered with 10 spare blades). RYOBI for models OLT1825, OLT1825M, OLT1830H, OLT1831H, OLT1831S, OLT1832, RLT36, RLT36C33, RLT36B33, RLT1825LI, RLT1825M13, RLT1825M13S, RLT1825M15S, RLT1825M20S, RLT1825M220S, RLT1830LI, RLT1830H25, RLT1831H25, RLT1831H25F, RLT1831H25FPK, RLT183113, RLT183225, RLT183225F, RLT183225PK , RLT183225FPK3, RLT183250F, RY18LT23A-115, RY18LT23A-120 , RY18LT23A-0, RY18LT25A-115P. Replaces original RAC155, 5132004559.