We supplied these custom vented titanium screws to our aerospace customer.  Parts were made domestically in the USA using ASTM B348 Grade 5 material and measured 2-56 X 7/8".  The vent hole has a diameter of .028 inches.  Lead time for similar parts is typically 8-10 weeks but expedited options are typically available upon request.  Our internal part number for this vented screw is SC-002014-UVENT.  Material certs were provided with the parts, as well as our certificate of conformance.