Toolbox Thread Checker Machine Screw Sizing Gauge

Perfect for the gunsmithing bench, our handy machine screw thread checker quickly identifies small fasteners.

Featuring nine sizes:
#4-40, #4-48, #5-40 #6-32, #6-40, #6-48, #8-32, #8-36, and #8-40

Material: Steel
Finish: Black Oxide
Length: 3-1/2"
Thickness: 1/4"