Bosch 1618598175 Chuck A This is an O.E.M. authorized part Fits various Bosch Parts models OEM Part Number 1618598175 This is a Bosch Parts replacement part Part Number 1618598175 Replacement Chuck for the following Bosch Hammers 11222EVS and 11236VS. Genuine OEM replacement part. See Description below for Other Commonly used OEM parts.