Question for you guys

It’s for spacing the torque converter the proper amount on the front pump drive. It has to have around .100 inch or so (there’s specs for each application, consult factory service manual) of gap between the torque converter and flex plate ( measured with the converter fully seated into the transmission) to give the plate and converter room to flex and/or expand without bottoming out into the pump drive. If it bottoms out excessively, it will wipe out the front pump and probably mess up end play through the transmission.