Specifications:
Length: 6-7/8" (175mm)
Shank: 3/8" dia. x 7/8" (10mm x 20mm) long
Feeler ball:1/8" (3mm) dia.
Dial readings:0-50
Measuring range: 0.250" (6mm) axis offset
Speed—recommended not to exceed approx. 800 RPM
Locating accuracy to within .0002" (.005mm) of true center
Capacity depends on feelers installed, but overall range is 5/32-12" (4-300mm) internal diameter; 0-12" (0-300mm) external diameter.