Core Pins are offered in 500 diameters.
Press Release Summary:

Original Press Release:
M-2 High Speed Steel Core Pins Stocked In 0.001" Increments And 500 Diameters
A full line of precision form ground M-2 high speed steel core pins that are double-tempered to Rc 60-63 and are stocked in 0.001" increments is available from Royal Diversified Products, Inc. of Warren, Rhode Island.
Royal M-2 Core Pins are offered in every decimal diameter from 0.010" to 0.505" in 0.001" increments, with 0.0002" or 0.0003" dia. tolerances, and eliminate the need to grind down fractional bodies for a precise fit. Double-tempered to Rc 60-63, these wear-resistant core pins have smaller head diameters to permit close spacing without modification.
Allowing moldmakers to jig-grind holes and then order a standard diameter from over 500 sizes to achieve a precision fit, instead of requiring a special design, Royal M-2 Core Pins are available from stock in standard 2", 2 1/2", 3", 4", 6", and 8" lengths. They are ideally suited for glass-filled applications.
Royal M-2 Core Pins are priced according to style, size, length, and quantity; with same-day delivery. Literature and price quotations are available upon request.