These end plates will prevent your battery modules from warping and swelling when you charge and discharge them. For Toyota hybrid Nimh (Nickle metal hydrate battery) 7.2 volt modules. What Toyota used except for a very few early hybrids up to 2016 when some models started using lithium batteries. Included is four blots and nuts as pictured. Modules are not include but shown in the picture to illustrate the use of these end plates. Included is a write-up on cleaning piston rings to reduce oil burn. (see last two pictures it is all the same piston.)