Adjustable step: 18-24m | Top - 17.7 in24-36m | Middle - 15in36-48m | Bottom - 12.6in Enhanced safety:Built with a non-slip platform and secure railing, our learning tower keeps little ones steady and safe. Its thoughtful design gives parents extra peace of mind every time it’s used. Quick and easy assembly:Flat-packed for a quick 15-minute setup with the included Allen key, our toddler tower is easy to assemble. Our step-by-step assembly instructions let you create a safe, sturdy step stool for your growing child in no time. Versatile design:Its versatile design fits any room and allows you to store it under the kitchen counter.