Comprising standard and extended jaw stroke models, Energy Series features self-contained construction with built-in air cylinder and extra-large thru-hole. Full spindle bore of lathe can be utilized for thru-hole work, and length of jaw travel maximizes clearance for through feeding pipe. While extended jaw stroke allows for processing pipe with upset ends, extended jaw travel features both rapid and clamping stroke. External or internal clamping of workpiece is also possible.