WC K4 BASIC 18W X 18DWC K4 BASIC 18W X 18D This is the k4 basic wheelchair with a 18" seat that is 18" deep. This model also have desk length flip back arms and swing away footrests. Durable, TIG welded frame with gray powder coat finish plus swing back, desk length arms with flip back armrelease for easy in and out Breathable nylon upholstery plus custom adjustability (dual axlehemi height and back height) provides a more comfortable patient experience Smooth rolling,