These custom trim aluminum diecast fittings for our lighting fixture customer were manufactured using ADC12 Aluminum Alloy material with plain finish.  Overall diameter measured 5.75" and the inside opening diameter measured 2.55".  2,500 pieces were produced in the first production run and a small partial was provided prior to the full balance.  Annual blanket purchase agreements are ideal for this type of part due to the space and cash output required to bring in the full amount in one shipment - we would instead spread out the annual usage over 12 months and invoice as parts are shipped out.