1. Material: stainless steel 2. Size: the diameter of a small wheel is about 22 mm, the width is about 26 mm, and the mounting screws are about 32x7 mm. 3. Weight: 4 wheels about 98 grams, 8 wheels about 145 grams 4. Purpose: sliding door 5. Features: smooth sliding, high-speed bearing with enlarged diameter pulley, good load-bearing, firm and stable, smooth and quiet, inclined surface design, wheel rolling process to prevent dust accumulation, with mounting screws, easy installation 6. Note: only hanging wheels, not the track in the picture
