Used camshaft timing gear.  This would bolt to the camshaft.  This is a stock gear, for use with non-vented Optisparks.  It is in good condition.  Fits the following:

92-94 LT1 Corvette
93-94 LT1 Camaro Z28
93-94 LT1 Trans Am

The item in the picture is the actual photo of the item being sold.