The Humanscale 5G adjustable arm mechanism offers all the advantages of the Humanscale keyboard arm 4G, including simple dial-a-tilt keyboard angle adjustability . The difference is that it has a wider track for more stability. 

Features:

• Intuitive, knob-free height adjustment (6 1/4” range from 5” below the mount to 1 1/4” above the mount)
• Easy, dial-a-tilt platform tilt adjustment from 0° to -15° for safe keying
• 22” track allows the unit to slide fully under the desk for storage, or all the way out for complete access
• Base 360° swivel
• Standard Track Length 21 3/4"
• Track width 5 3/8"
• Alternate Track Lengths 16” and 18" (available as special order)
• End of Track to Beginning of Platform 6"
• Max Depth Below Bottom of Keyboard 1/2"
• Unmatched stability for sure keying and mousing
• Made of steel for strength and durability
• Lifetime Warranty