Our Anti Drop safety Brakes are intended to be used on roller shutter doors to stop the doors dropping/guillotining.
Our N2 Safety brake is for use on small shutters and requires a 13mm and 18mm shaft.
The 13mm square hole is to suit idlers for 60mm / 70mm octagonal tube and can be used upto 134Kg
The 18mm square hole is to suit idlers for 89mm / 97mm tube and can be used upto 165Kg