Sliding Transfer Bench w Cut Out Regular Hip Knee Post Surgical Prdct 18 X 16 * The MSHQ 1594XL 18 X 16 * The contoured design combined with the simple operation of the ISOFLO© Memory Control unit offers provides a new level of postural control and stability that has never been achieved in an air cushion * The contoured design positions the pelvis back in the wheelchair and centers the individual comfortably in the middle of cushion * The ISOFLO Memory Control unit locks air into each of the four compartments providing stability by minimizing side to side and front to back motion * Adjustable to individual 8 cm) stainless steel handrails on three section slim line lifting columns that provide maximum lateral stability even in the highest bar position It's designed for personal cleaning purposes only No tools necessary for assembly