It has a quick magnetic release to be able to quickly view your rideline without having to remove your shear
To use:
losen the rear angle locking nut and set the j firmly on the ruby stone once set lock the jig in place to achieve optimal ridelines on curve shears.
To clean the ruby stone use a light mist of wd40.
WD40 can also be use as a lubricant during the motion of creating or establishing your rideline.