Game Warning Clear Fiber Optic Apertre 10/32 A revolutionary light weight scope that is as economical as it is functional. The fiber optic scope is designed for both hunting and 3-D tournament shooting. Available in clear, this unique scope features crosshairs a mere .022" thick with a fluorescent light gathering fiber optic pin dead center. This pin is made to always be parallel with the line of sight. The scope's inside diameter is 1 1/8" and is brass inserted on the top, bottom and side with an 8/32 thread for additional fiber optic pins if desired.