An optional product to attach the Shoe Base on a Float Arm, Mega Float Arm or Mega Float Tube. Also usable to attach the Shoe Base II on the M5 Joint installed on a Stick Arm or Multi Ball Arm to hold a strobe or LED flashlight on the middle of arm (*1). (*1) Unable to attach on the "Multi Ball Arm SS". Weight : 20g (0.7oz) [air] / approx.12g (0.4oz) [underwater] Compatible arm : Float Arm S/M/ML Mega Float Arm S/M Mega Float Tube S/M M5 Joint Stick Arm XS-T/SS-T/S-T/M-T/L M5 Joint Multi Ball Arm /ML/L/LL/XL