High quality stages for manual control applications Semprex's proprietary KORE-FRAME links X and Y axes in a single piece of metal for excellent rigidity and superior accuracy. Patented steel friction drive ensures smooth, backlash-free operation and is proven to last much longer than rack and pinion gear drive systems. Bearing slides made from single piece hardened steel use cross-rollers for smooth, free-running, consistent travel. Maximum load 18kg (40 lbs) at center of travel. Includes glass insert with precision grade flatness or solid top.