Description
Starrett 121 tubular inside micrometers are designed for large internal measurements beyond the capacity of most other micrometers. Each set consists of a micrometer head mounted at the end of a tubular holder in which measuring rods can be inserted and adjusted to the desired size. Final size reading in thousandths of an inch (.001") is obtained using the micrometer head. With 3 Graduated Measuring Rods & 2 Extension Rods 32"-107", 3 Graduated Measuring Rods, 2 Extension Rods, Case With 3 Graduated Measuring Rods & 2 Extension Rods.
