Camco RV Stabilizing Base Pads - 4 Pack, For Use with Most RV Cross-Frame or T Type Stabilizing Jacks (57883) Use with most RV cross-frame or "T" type stabilizing jacks Four pads per box Base pad has a 7 diameter and fits jacks with a 2.5 foot or less Wide pad construction for greater stability Installation hardware and anti-rattle rubber grommet included