Heavy-duty Enfroe lifting clamps here. Got a Vertical Lift Model FR, that one is 2 ton capacity for plates 0-1 inch thick. Also a Model JPA, that one is 1 ton capacity with a jaw opening 0-3/4 inch. Both made in Jacksonville, Fla.
Also a Lucker brand 1 ton looks like 0-3/4 inch
Small 600 pound capacity brass one
$150 for 2 ton
$125 ea for 1 ton
$50 for 600 lb