CT-450 Retractable Gap Gauge High impact red plastic case contains 4 sets of accurate retractable go and no go wire gauges: Two sets: .015-.019 (.016 Nom.)/ 0.40-0.50mm Two sets: .018-.022 (.019 Nom.)/ 0.45-0.55mm Size: 3 1/2 in./8.9cm long; Weight 1 1/4 oz./35g Replacement package of 4 wire gauge sets complete as described above. Order Part No. CT-450-WG.