The HERCULES Speaker Adaptor SS100B is safe and secure and fists speaker mounts from 35 mm - 40 mm (1.38" - 1.57").

•  NOTE: If the Speaker Adaptor is not weighted down by the speaker, please turn the top knob counter-clockwise to extend the adapter length. Effect insertion length 90mm - 110mm.
•  The Quick-N-EZ Speaker Adaptor expands from 1.38" (35 mm) to 1.57" (40 mm) to fit the speaker stand mounts. Maximum load capacity to 50 kg (110.2 lbs.)
•  Weight: 0.8 kg (1.8 lbs.)
•  Height: 170 mm (6.7")
•  Size: 175 mm x 82 mm x 55 mm (7" x 3.2" x 2.2")
•  Load Capacity: 45 kg (99.2 lbs.)