Borescope Extension Tube

Alum alloy seamless tubing; anodized,black matte; 43.120 in. oa lg; 2.084 in.id; 2.250 in.od; engra=e complete circle every 6 inches,other inch marks 0.760,characters 0.150 h,lines 0.010 deep x 0.015 w; engrave legend and pn 11584733 as shown on dwg; fill all engravings with permanent white finish general characteristics item description

A tubular item used to extend the length of a basic device to cover the various ranges fo internal visual inspection requirements. It may be engraved with circular graduations in units of linear measurements on the periphery and engraved the full length with a longitudinal line for the purpose of indexing the borescope.