Nov design bike tool kit with titanium spanner (15mm) fits right on your folding bike and includes the necessary tools to fix a Brompton. Toolkit can be attached on Brompton stem. One set include: Stainless steel hex wrench (2, 2.5, 3, 4, 5). Titanium spanner: 15mm, 10mm, 8mm. Weight: 65g (+/-1g).