Heavy Duty Ball Bearing Linear Slide SDC43N-1490-290 C-Shaped Guide Rail 43x1490mm, 290mm Internal Carriage Linear Bearing but the TWN blocks are

but the TWN blocks are twice the size as if they were two SPBs fused together

3D Printer HFA (High Flow Adapter) Extruder Nozzle of 2

25" length

Square Flanged Plain Linear Bearing with a 3/4" compensated ID

Heavy Duty Ball Bearing Linear Slide SDC43N-1490-290 C-Shaped Guide Rail 43x1490mm, 290mm Internal Carriage Linear Bearing but the TWN blocks areBall bearing linear slide with a 43mm width, 1490mm length and 290mm internal carriage for high load guided motion with a maximum stroke of 1150mm. This SDC Series linear guide uses hardened steel drawer slide technology in a fixed C shaped rail profile, keeping the internal carriage captured inside the rail rather than telescoping outward like a full extension drawer slide. A precision ball cage assembly travels between the carriage and rail