Features: 100% brand new and high quality Ergonomic Design - Perfectly provide support for the weight of arm. Keep the wrist, hand and elbow in a straight line, and take the arms, shoulders, neck and spine s stress off. Dimension - The armrest is 11.4 x 5.5 inch, will be higher than the table top while installation. Suitable for the table which is 0.5 to 2.3 inch thick without decorative strip or bevel in edge. The fastening clamp have a rubber to increase the friction between the clamp and the table to stop slipping. Material - The surface is covered by rubber which is difficult to fall off, different from the plastic pad. The adjusting screw and clamp is made of ABS, which can swivel back-and-forth. No need to assemble, can be installated in less than 5 minutes. Package Includes: 1x Arm Rest Support Specifications: Material: ABS Color: Black, Red, Yellow (optional) Hand Rest Size: About 29x14cm/ 11.42x5.51in Screw Size: About 8cm/ 3.15in Connection Clamp Size: About 6cm/ 2.36in note: Due to the lighting effects and shooting angles, there is color difference in the product, please understand. Due to manual measurement, there is a tolerance in the product size.