GM 4 Button Prox 4B4 (HYQ1AA) -by Ilco 1981-Mercury-Monarch it is an essential tool

it is an essential tool in the locksmith industry

this OEM Uncut Transponder Key is a valuable addition to any locksmith's or key cutter's collection

This cylinder comes keyed 5-pin (SC8) but can have a 6th pin (SC9) added

keyed-randomly

1995-Oldsmobile-Ninety Eight

GM 4 Button Prox 4B4 (HYQ1AA) -by Ilco 1981-Mercury-Monarch it is an essential toolExperience precision and reliability with the GM 4 Button Prox 4B4 key blank by Ilco. Made from high quality materials, this key blank is perfect for locksmiths and professionals seeking precision in key cutting and duplication. Simply add it to your key blank supplies and see the results in your locksmith services.