?Spring loaded with locking knurled knob. Range: 5/16" - 6" (8mm to 150mm).
?Stainless Steel Construction, Titanium coating finish.
?Constant spring tension gives uniform contact pressure.
?Double action rigid handle with self centering feature for quick checking of holes, slots and recess up to 6" deep.
?Contact points are hardened tool steel and precision ground in the end measuring radius.