Using your BIG-SERT P/n 3700BS with this Reverse Add-On kit you can go backwards to the the First time smaller black Time-Sert inserts. ADD-ON KITS ONLY PROVIDE THE NECESSARY TOOLING TO CONVERT FROM BIG-SERT P/n 3700BS TO Time-Sert P/n 3700 You must have the BIG-SERT P/n 3700BS kit to finish the repair. What is Included: Drill, Tap, Bushing, line pin, sealer, oil and 10 Inserts P/n 112030 . Tool setup video here.