This kit makes it easy to convert your standard crib frame into a fire evacuation unit. Kit includes 5" non-marring casters (2 locking) with extra threshold strength and 4 solid steel caster brackets that attach to the steel frame carriage of the crib. Assembly required. Lifetime warranty. Compatible with cribs: #24929 Safe & Sound™ Fixed Side Clearview Crib, #24930 Safe & Sound™ Easyreach Compact Crib, and #25957 Safe & Sound™ Fixed Side Mirror Compact Crib (all sold separately).