US Stock SFX BT40 Pull Stud Spanner Wrench Fit BT40 Pull Stud Retention Knob

In this video you can see the BT40 wrench. The surface hardnessof spanner is higher than pull studs reaching HRC58-62 to be durable. Avoid skidding and accidents. Blackening the surface of the spanner and installing the rubber handle after chroming gives it adelicate appearance and a comfortable feel.