Cap threads onto base and is less likely to get lost or knocked off|Taller cap eliminates the need to cut bolt|Base create a tight seal that helps provides a continuous sanitary seal between base and toilet|Available with or without PlumbPerfect nylon closet bolt|Cap screw onto base for a secure connection|Can be installed on new and existing toilet|Can be used with both 1/4 in and 5/16 in bolt, maximum L 2-1/2 in|Boss on base prevent spinning during installation or removal