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.
Thexton 353 GM Carburetor Idle Mixture Seal Plug Remover Tool
Thexton 131 Ford Idle Speed Control Tester
Thexton # 802 Carburetor Idle Mixture Adjusting Kit
Thexton 2500 GM C-3 TBI ADJUSTMENT Kit Set with instructions
Thexton 2500 GM C-3 TBI Adjustment Kit Set
Thexton Tools Parasitic Current Battery Drain Test Adapter No. 431 NOS USA