A standard slate guillotine uses a blade to cut slate up to 7mm thick. The blade is held in place by the arm of the guillotine and is usually replaceable.
Handle
One end of the guillotine’s arm has a handle, which is sometimes PVC covered. The handle is pushed down to force the blade through the slate.
Hole punch
Some slate guillotines have a hole-punching facility, which consists of a punch pin located on the arm.
The punch pin, which is usually replaceable, is used to create a hole in slate so that it can be hung on the roof.
Mounting hook
Standard slate guillotines are small enough to be carried onto the roof, and used there.
You can even purchase slate guillotines with a mounting hook, so that you can hook the guillotine onto the roof where you’re working.