Thank you for choosing Performance CBN for your valve guide reaming needs.  We undertand the demands of the modern engine shop, and have crafted this easy order page for carbide valve guide reamers.    Simply fill in the final OD deminsions and the pilot size.  Length, pilot length, and flute lengths are all standard per our catalog.  We can customize these dimensions, but you will need to email that style of custom tool order into our sales department.  However, this is the speedy order form for custom OD and Pilot OD for our performance carbide valve guide reamers.  Feel free to order via phone as well.