1/4 Bsp Button Head Grease Nipple , Type M1 , Head Size-16Mm, Straight Version- A/180 De G, Hex Size- 17Mm , Max. Overall Length - 22 Mm According To Din 3404 For Conventional Memu And Ac R Etro Coaches. [ Warranty Period: 30 Months After The Date Of Delivery ] ]