a jig, you set it to your boot size, then align it with the centre marker on your skis, then it has holes set where to drill, diff companies make diff jigs for their bindings
'Don't like hesh - Don't like rap - kicked ol' sally cos she fat - I'm a jerk I'm a punk took a shower cos I stunk - smoked a bong killed a cat - had my nuts attacked by rats dad got nude - I wore a thong - for a hobby I make bombs' Tom DeLounge