This part number matches the current model number 990940
Part #990940
This is an authentic OEM sourced part which is specially designed for use with Hitachi rotary hammers. It is an identical replacement for a missing or faulty distance piece that was installed on a new unit, please make sure to check the appropriate diagrams of your model for the correct location and application of this hardware. Keep in mind this high-quality part is made of durable metal and is sold individually.