Handy folding crank makes extending your speaker pole quick and easyA convenient crank-up subwoofer attachment shaft that lets youInner shaft sized for standard 1-38" pole mount insertsEquipped with friction safety knob and stabilizer ring for added securityMinimum Height Adjustment is 34"Maximum Height Adjustment is 52"Top
Diameter: 1-38" ( 1.375" )Center
Diameter: 1-58" ( 1.625" )Max weight capacity 80 lbs.