Create a cot dolly with ECR4Kids Cot Casters. A great addition to preschools, daycares and homeschool environments, heavy-duty cot casters allow you to roll the stacked cots in and out of storage.Designed for use with both standard and toddler size cots, the pack of four casters includes two locking and two non-locking. ELR-023 is sold in a pack of four.