Vantech 45″ Roller System with 24″ Long Extension Plate for H1 Series Model ROH124-45BVantech 45 Roller System with 24 Long Extension Plate for H1 Series Model ROH124 45B The H1 45 Roller with 24 Extension Plates extends the contact point of the rack passed the rear door. Eliminating damages that may occur when loading and unloading Ladders, pipes and other material or equipment. Extension Plates and Roller are made from aluminum. The roller is slightly lower than the cross bars on the rack to not interfere the placement of your