Editorial Product Review:Item Description:Used for centering templet guides - Features: for precise centering of templet guides & attached subbases - Specifications: Part Number: RA1150, Used on Model No. : 1613AEVS, 1617/EVS, 1618/EVS, 1619EVS, Sales Pack Quantity: 1.
Amazon.com Item Description:The Bosch RA1150 Centering Cone allows for precise centering of template guides. It's designed for use on models 1613AEVS, 1617/EVS, 1618/EVS, and 1619 EVS.
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Buyer Reviews
Average Buyer Rating:

Customer Rating: 
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Its one of those things you just have to have to make things work.
If you ever take off your sub-base you will need this to recenter everything, and its a must for centering your collars for accuracy went doing dovetails and other precision work.
Whenever I got it I took it out of the package and wondered why I had to pay 7.50 plus shipping for this little piece of steel. But it is a must for your router work and a worthwhile buy however simple and somewhat overcharged (ok I am a grump about it, its not the mild extra money its just the principle of what you give for what it is) this item is.
Customer Rating: 
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centering cone for Bosh routers
I am very pleased with the centering cone I recently purchased. I can be sure my router is properly aligned when mounting it in a stand.
Customer Rating: 
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Is very nicccce!
Nice centering cone...it really...centers. Yeah
Too bad Bosch wouldn't include one with the router. Gee whiz.
Customer Rating: 
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Align the base plate so it is near perfect
My Bosch 1617EVSPK has a smooth base attached to the bottom of the router.
Bosch is very careful to center the base plate on the base (in case you say remove it to attach to a router table). Although it is easy to provide a very close center, it is not as good as the factory center.
Using this centering cone, you can easily provide an improved center for the base for better algnment. Then again, the routers shipping now include the centering cone.