FUNCTION -- This battery tray is designed to securely mount your battery in your vehicle by using sturdy base plates and hold-down plates and includes heavy duty 3/8" hardware. FITMENT -- Overall dimensions of the base plate are 11.25" length and 8.5? width. It will fit batteries up to 10.5" Length x 6.95" width x 6.7" height with provided thread sleeves(batteries over 7.4" tall will require longer 3/8-16 all-thread). COMPATIBILITY ? Compatible with most car and truck batteries including the following Optima sizes: Red top 34 34R 34/78, Yellow Top D34 D34/78, Blue Top 34M D34M(may fit more batteries). QUALITY ? The whole battery tray include 1 base plate, 1 top plate, 3 all-thread hold downs with nuts, 3 thread sleeves. They are made of aircraft grade alloy aluminum, hardened to be solid and durable, electroplated to be rust and corrosion resistance for long term service. Item in last 2 pictures is exact item you will receive, shipped same day or next day depending on time!