2 pieces brand new and high quality door wheels. Diameter 70mm. Width 34mm. Inner hole 15 mm (34 x 70 x 15 mm). This sliding door roller track set helps the door balance, prevents swaying and provides a smooth glide. An ideal wheel for assembling your own industrial furniture. This is relatively heavy for building a workshop door and two rollers are sufficient and roll well despite the weight. Move the door to save space and decorate and beautify your home. Our groove wheel is made of zinc alloy and nylon, durable, stable property and long service life. Easy to install and use. Specification: Material: zinc alloy, nylon. Size: approx. 7*3.4*1.5cm/2.75''*1.34''*0.59'' Applicable: barn door. Scope of delivery: 2 * barn door wheel