Check the listing for details. SPI 13-515-2 And SPI 13-515-5. Condition: Used. Listed at 250.00 USD. This is a SET; SPI thread micrometer set with a 0-1 inch range and 0.001 inch graduations.The kit includes interchangeable anvils for measuring various screw thread pitches.It features a ratchet thimble for consistent pressure and a spindle lock to hold measurements. And This is an SPI screw thread micrometer set with a 1-2" range and 0.001" graduation.The set includes interchangeable anvils designed for measuring 60º screw threads. These tools are generally used in manufacturing and machining for precise thread measurements.