Self locking ratchet pawl prevents premature release and allows positive locking action.
With 5 size:
^_. A.2"Height capacity: 1-1/2"to3-1/8"(40-80mm)
^_. B.3"Height,capacity: 2-1/8"to5"(53-125m)
^_. C.3"Height,capacity: -1/8"to7"(53-175mm)
^_. D.3-1/2"Height,capacity: 2-1/8"to5"(54-127mm).
^_. E.3-1/2"Height,capacity: 3-1/2"to7"(89-178mm).
^_. F.4"Height,capacity: 2-3/8"to7"(60-175mm)
^_. G.6"Height,capacity: 2-3/8"to7"(60-175mm)
^_. H.6"Height,capacity: 2-1/2"to7"(90-175mm)