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  • Range 8-150mm, 5/16-6"
  • For quick and accurate measurement of bore diameters
  • Hardened stainless steel automatic self-centering plungers
  • Locks on any setting by turning the knob at the end of the handle
  • Spring loaded cylinders
  • Size obtained by measuring over contacts with a micrometer or caliper
  • Housed in a heavy-duty storage case with EVA foam inserts
  • SP Hand Tools are covered against manufacturing defects or faulty materials. This warranty does not cover overloading, abuse, misuse, and/or normal wear and tear. All SP Hand Tools are designed and manufactured for specific purposes and if not used for that intended purpose they will not be covered by the lifetime warranty. Exemptions - All measuring equipment (12-month warranty), battery-operated wrenches (24-month warranty), striking and cutting tools (6-month warranty).