This clamp can be attached to a desk or other flat surface with a thickness of up to 4.7cm (~1.85in). The hole for the lamp arm is 1.3cm (~0.51in) in diameter and about 3cm (~1.18in) deep. Can be used with any lamp or microphone arm, that has a base that fits those measurements. The chunky design is robust and more reliable than cheap included Desk bases. The screw has a slit in its head, so it can be loosened with a tool, if it gets stuck. Solid internal structures make it even stronger, than the thick look would imply. The color in the Images is not the color this will be printed in.