in width so check that the guide will fit on your block. if it does not fit, sand it until it does.
the guide has two sides, one for drilling straight into the block and the other for drilling at a slight down angle. this side is used when drilling into the back of a wedge shaped block where you want the hole to follow the slope of the top of the wedge.
if drilling a long hole in a wedge shaped car, you can drill at a slight down angle to follow the slope of the top of the car. place the guide on the back of the block so that 