Khushbu Engineers India offers: SP425 is a 4 Spindle Single Pass Progressive Honing Machine with bore limit of 5-15 mm and maximum bore length of 75 mm. SP 450 is a four spindle machine for components of bore dia up to 38 mm. Stock removal, surface finish, Productivity etc. determines the selection of the suitable spindle configuration. SP 650 is a six spindle machine intended to meet the prerequisites of high creation for parts of bore diameter up to 38 mm. Here the configuration is six spindle and eight stations, Contact Us Now.