Thexton Tools. Flex Shaft - about 9.25" overall. I believe it is designed for 78+ GM models, but you could confirm. Overall in used condition. It shows signs of use, wear and imperfections. However, I did not see any major performance issues.
GM OEM NOS Thexton 362 GM Computer Controlled Carburetor Tools Varajte Dualjet
Thexton 2500 GM C-3 TBI Adjustment Kit Set
Thexton Tools Parasitic Current Battery Drain Test Adapter No. 431 NOS USA
THEXTON TOOLS MASTER CYLINDER BRAKE BLEEDER KIT # 803
1489 26" Large Snap Ring Pliers Replace for Lang Tools GM 5L40 5L50 6L50 6L80
CTA Tools GM Hub Nut Remover/Installer Tool 5900