【3" Caster Wheel with Brake, edge mounted for 3/4" boards (18mm)】 Comes with brake for added stability. Works perfectly to upgrade on our book cart 10968:https://www.fixturedisplays.com/index.php?route=product/search&search=10968
【Durable Material】 Made of chrome plated steel for durability and resistance to corrosion
【3.94" mounting height】 3 inch wheel diameter, 0.9 inch wheel width, and 3.94 inch mounting height
【High Load Capacity】 Supports up to 110 pounds of weight each for smooth and silent movement
【Assembly Video】Video Instructions link: https://youtu.be/QnLye8uggbU. You can also search "10968 3 inch castor wheels for board edge mount book cart fixturedisplays" on youtube to locate the video. You can also download video by following this link: http://www.fixturedisplays.com/video/10968 3.AVI