The 4 Inch Right Clamp has a jaw length of 4" with the larger 3/4" Base Angle and and longer screws. End Screws adjust Clamping Tubes to provide uniform pressure over the length of the clamp. Three 1 inch Base Angle Notches allow locations to apply glue to inside corner of the joint and adding corner stiffeners. Clamp can also be used for joining other materials up to 5/8" thick.  It is well suited for medium size structures.  A pair of clamps can hold longer parts from both ends.
Photos show a 4 Inch Right Clamp on an 3 story HO wood structure kit.