Features: Protect your floors: The small casters can safely glide on your hardwood flooring, tile, marble, carpet with ease without making a scratch or noise, but it's not recommended for rough road surface at outdoors. Suitable occasions: These low profile wheels are ideal for a huge variety of uses, such as DIY projects, industrial applications, home, schools, garage, shops, trolleys, table, hospitals and other occasions. Specifications: Material: plastic, rubber and metal Color: as shown in the picture Wheel diameter: 1 inch/ 25 mm Mounting height: 1-1/2 inch/ 38 mm Top plate: 1.5 x 1.3 inch/ 38 x 33 mm Load capacity for 4 small caster wheels: 100 lb Package includes: 12 x 1 Inch caster wheels 50 x Screws Note: Manual measurement, please allow little size errors. The wheel brake is not double lock, it only locks the wheel. The colors shown on picture may be biased from the true color, please refer the real objects.