Secure your battery while maintaining access to terminals Our trays hold batteries securely in a sturdy frame made from noncorrosive, rigid black polypropylene. Two 1/4" stainless-steel tie rods with adjustable self-locking security knobs hold the frame in place while providing access to the battery top and terminals. Our hold down trays have a pre-drilled base that allows easy installation. Ideal for applications that do not require batteries to be completely encased. Key Features Non corrosive rigidpolypropylene frame Stainless steel rods secure top frame to base Self-locking security knobs Pre-drilled base for easy installation Three different sizes to fit group 24, 27, and 31 batteries