SPI Back Plunger Dial Indicator Set Ideal for fast, accurate setups and measurements on lathes, milling machines, planers, shapers, etc. plus various inspection applications. Each set includes the following... Test indicator, fully jeweled Universal clamp Toolpost holder 5/16" x 3" holding rod 5/16" x 5" holding rod #4-48 thread size "G" Clamp Features include... Lever attachment Domed, tapered, and standard anvils Furnished in fitted case Range 0.1" Reading 0 - 100