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

Features:
The Quick-N-EZ Speaker Adaptor expands from 35 mm - 40 mm (1.38" - 1.57") to fit the speaker stand mounts. Maximum load capacity to 50 kg (110.2 Ibs.).

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 90 mm - 110 mm (3.54" - 4.33").