Industrial casters, heavy duty casters advantages: Can easily "brake"-the brake locks the steering and completely stops the bike Can rotate 360 degrees (around its own axis) Proven quality-thousands of satisfied customers The roller is made of galvanized steel solid rubber, so it is very suitable for indoor and outdoor use () Product parameters: Material: rubber galvanized steel bracket Wheel diameter: 3in 7.5cm, 4in 10cm, 5in 12.5cm Rim width: 1.4 inches 35 mm Total height: 4in 10cm, 4.9in 12.5cm, 6in 15.2cm Mounting plate size: 3.8x2.6 inches 96x66 mm Distance between mounting holes: 3x1.7 inches 75x44 mm Load capacity: single wheel load 100kg 441 pounds Easy to install: We will provide you with screws so that you can complete the installation in a short time. Package Contents 4 swivel casters (with screws) Casters can be used in a variety of applications, including: flight cases, instrument cases, exhibition display equipment, wooden furniture, tool boxes, light machinery, equipment supports, mobile workstations, speakers, cabinets, supports, electrical enclosures, furniture, etc. note: Due to manual measurement, the size error is 1-3cm. The color may be slightly different due to screen differences. Thank you for your understanding. The arrival time is about 10-15 days, please be patient. I am very happy to serve you and wish you a happy shopping.USE FOR MULTIPLE USES: These castor wheels are perfect for so many different uses. Use them for industrial shelving, storage units, toolboxes and work saw benches. You can use them around the home for furniture such as kitchen islands, desks, ottomans, toy shoe bins, outdoor planters, shelves, coffee tables, chairs, and cabinets. Additionally, use them for display exhibition equipment, flight instrument cases, dollies, speakers, and many different types of machinery equipment. The casters have a long service life and are very suitable for heavy objects transported in schools, hospitals, factories, workshops, logistics and warehouses or only for private use!. Heavy-duty rubber casters-high-quality and highly elastic rubber material, wear-resistant, shock-absorbing, and noiseless. The new thermoplastic rubber is resistant to high temperature and other environments, and can run smoothly even on wet surfaces. Double ball bearing-double-bearing with embedded ball, made of high-quality steel, double-ball precision bearing with supporting steel sleeve, making the wheel rolling silently and smoothly. The tire width is 3.5 cm, each roller has a load capacity of 100 kg, and it can rotate 360 horizontally, making it more stable in anti-skid and grip. With brakes, safety stability is higher.