Insize 3221-20, TUBULAR INSIDE MICROMETER, 8-20″, 6928640328664

Graduation .001″
Accuracy: [.0003+.00005(L/2)]”, L=maximum measuring length (inch).
Optional accessary: setting ring (part no. 6313), gage block accessory (part no. 6881), cylinder gage block (part no. 4001), caliper/height gage checker (part no. 6884).