StarTech.com Adjustable Arm Rest for Office Desk, Ergonomic Arm/Elbow Support, 360-Degree Rotation, Clamp-On/No Drill Installation - Arm Rest for office desk - Swivel motion for typing/scrolling - Ergonomic designEnhance comfort and posture by reducing stress on the shoulder arm wrist while using a laptop desktop; Ergonomic design supports swivel motion for typing scrolling 6 levels of height adjustment from 0. 2in ( 5mm) to 2. 7in (70mm); Full 360 deg of motion Solid die cast aluminum; smooth foam padding on arm pad Ships fully assembled ready to install; Tool less clamp on installation with no drilling required no damage to desk; Fits desk thicknesses up to