This hinge bolt kit is not compatible with v1.2 scooters. v1.2 scooters already have upgraded hinge bolt. If your lock pulls magnet it’s v1.2 model.
To install 8.00mm diameter kit, no special tools are needed and frame holes stay the same diameter as on stock.
To install 8.15mm or 8.25mm diameter kit special reamer is needed, do not order 8.15mm or 8.25mm diameter kit if you can’t bring your scooter for me. The price includes work needed for making holes for axis.