All Measurements are Inside tray measurements. Ratchet Strap and screws (12x1) Included.
 

Ionic Single Cranking Tray ( 12-5/8" x 6-5/8") - Fits 1 Ionic 100ah or 125ah (***This does not fit a regular group 31 battery)

Ionic 50ah Single Tray (7"x 8") - Fits 1 12V 50ah Ionic Battery

Ionic 50ah Dual Tray (13-9/16" x 8") - Fits 2 Ionic 12V 50ah Trolling motor batteries. 

Ionic 50ah Triple Tray ( 20-1/8" x 8") - Fits 3 Ionic12V 50ah Trolling motor batteries. 

Regular Single Cranking Battery ( 13-3/4" x 7") - Fits all Millertech Group 31 size batteries (12V, 24V, and 36V). This will also fit a Lead Acid or AGM Group 31 Battery.