The Aven Tools 26800B-534 Double Arm Boom Stand is ideal for inspection applications that require magnification adjustment and the ability to move easily across a specimen. Smooth movement of a ball bearing slide allows you to move your microscope easily over and across the object being viewed. A heavy base (21 lbs) provides excellent stability. The stand will accept microscope bodies from the SSZ, SPZ, DSZ and NSW series. For microscope or lens attachment, a focus mount SCW-PA with tiltable arbor 26800B-521 or E-ARM is required.