Guide Brackets With Corrugated Reinforcement K-18 The K-18 Ribbed Elevator Rail Angle Model is the smallest model of the ribbed series used to support T70-T89-T90 elevator rails. Product Code: K-18 The opening of the elevator rail guide Brackets of this model is between 50 and 85mm. [.rar] K-18 Ribbed Bracket DWG File [.rar] K-18 Ribbed Bracket Front DWG File