Fowler Rod-Anvil Tube Micrometers are positioned at a 90° angle in respect to the axis of the spindle, making it practical and convenient for measuring wall thickness of tubings and other workpieces with cylindrical walls. • Hammertone blue baked enamel frame. • Anvil is hardened and precision ground. • Carbide tipped spindle • Spindle thread is hardened, ground and lapped. • Positive lever-locking clamp. • Ratchet thimble • Microfine graduations on satin chrome finish permit easy reading. • Measurements can be taken at locations far from the end due to the protruded rod-anvil design. • Meets or exceeds Federal accuracy specs. • Includes wrench for quick and easy zero adjustment on sleeve and case