QUESTION: What does it mean when it comes to base width and depth of the sliding transfer bench? ANSWER: The base width is the distance between the legs inside and legs outside the tub. This helps you determine how much space the bench will take. So you can measure to determine the portion of bench sticking out of the tub. The depth is the distance between the two legs either inside or outside. For more discussions, options and details about the product, or to order the product, please click here This user friendly medium length heavy duty sliding transfer bench can hold up to 300 lbs. with molded swivel seat for easy cleaning and dry. This Long sliding transfer bench features molded swivel seat that enables user to turn every 90 degrees before getting in and out of the bathtub or shower. Makes patient transfer even easier and safer. Double safety locks on each side of bench allows user to get on the bench safely before sliding to the other side and locking the bench while inside the tub or shower. Height adjustable in 1/2" increments. Seat Width: 20.5" Seat Depth: 13.5" Seat Height: 18.75" - 23.25" Actual Slide: 19" Rail Length: 33.875" Base Width: 41" - 41.75" Base Depth: 18.25" - 19" Back Height: 12.5" Required Clearance: 14" - 18.5" Leg Length: 9.8" Weight Capacity: 300 lbs.