Replaces lost or worn out factory T40 ratchet & Bolt Lifetime Warranty on both parts CR-V (Chrome Vanadium for correct hardness properties and corrosion resistance) Bolt manufactured to factory specs / easy install Fits painted and transparent roofs 84-96 Chrome Vanadium Corvette Roof Panel Installation / Removal Wrench and rear attach bolt. These bolts commonly fall out and get lost. The wrench is an affordable alternative to the pricey replacement ratchet. Ergo friendly torque length for easier tightening and loosening. Multi-use can be used for other GM bolts with anti-tamper bolt heads. About Us- We've been manufacturing replacement Corvette T-Tops and Roofs for over 35 years.