Orthopedically contoured back provides trunk and head support for children and junior adults. Locks at any height from 18"-24". Features adjustable harness and toilet seat reducer ring. Base easily bolts to toilet for security. Fits all institutional and home toilets. Footrest/armrest sold separately. Chrome-plated steel and high-impact, white ABS plastic. Note: 6228 and 6227 have same dimensions, but 6228 sits further back for the larger child. 6227 includes reducer ring, 6228 and 6229 do not.