SPI - Inside Dial Caliper Gage: 95 to 120 mm, 0.025 mm Graduation, 0.038 mm Accuracy - 65378366 - MSC Industrial Supply
Gagemaker BX-1000-1, Face Groove and Hole Location Gauges | BX Series | Range 2.6” - 13” (66 mm - 330.2 mm) | Groove Diameter | GENERAL TECH SHOP
Ring Grooves | Gagemaker
Ring Grooves | Gagemaker
RTJ Ring groove face caliper
Rtj Ring Groove Digital Calipers with 23 Degree Conical Points-Newly Designed - China Rtj Ring Groove Vernier Caliper, Ring Joint Caliper | Made-in-China.com