Caldwell's new Vacuum Upender can be used to handle numerous non-porous materials. Eliminate the additional work pieces and manpower required to properly position your product. Twin Crossarm Models have four pads and are available with main beam lengths of 4', 6' or 8' and crossarm lengths of 3', 4' or 5'. Quad Crossarm Models have eight pads and are available with main beam lengths of 6', 8' or 10' and crossarm lengths of 3', 4' or 5'.