Sealey brake disc calliper 0 56mm with tyre tread depth gauge sealey vs057 unique lever action floating jaw assembly enables easy removal of caliper from disc while retaining reading ideal on discs that have a wear lip features a tyre tread depth gauge at the base of the caliper and scale lock metric scale with 1mm graduations sealey vs057 brake disc caliper 0 56mm with tyre tread depth gauge