Material: The rolling library ladder hardware kit is made of carbon steel material, is sturdy, and long service timeLadder Hardware Kit: The rolling library ladder hardware kit with upper rollers and lower rollers. The upper rollers are interspersed between the rails to achieve silent sliding, and the lower rollers are equipped with brakes, wear resistance, and durabilityEasy To Install: The rolling library ladder hardware kit is easy to install and does not require complex steps to complete the installationPackage Included: The rolling library ladder hardware kit Includes 1x 2m track, 2x Top Rollers, 2x Floor Rollers, 2x Stopper and other installation partsLadder Accessories: The rolling library ladder hardware kit is a great practical accessory, when you need to move the ladder multiple times, these accessories will help you move the ladder flexibly Specification: Material: Carbon Steel Size Chart: Rail length: 2 m/78.74 inchPackaging size: 103 cm x 14.5 cm x 9 cm/40.55 inch x 5.71 inch x 3.54 inch Package Includes: 1x Rolling Library Ladder Hardware Kit Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.