Ultimate SP-100 speaker pole - adjustable speaker adapter, universal subwoofer adapter, air-powered lift asist, Height Range: 964mm - 1520mm, Upper Tube Size: 38,10mm, Lower Tube Size: 44,45mm, Weight Rating: 68.2kg, Weight: 2,58kg, poles feature an expanding cylinder system that will firmly fit multiple speaker sockets from 1-3/8"" to 1-1/2"" diameter. Using a 2mm hex wrench, the adapter can also be removed to provide standard M20 threading, material: aluminium