This is a top quality gauge for checking size and thread pitch of screws, bolts & nuts.
Works with fractional (standard) or metric screws & bolts.
 •fractional screw/bolt size range: (#4 to 1")
 •metric screw/bolt size range: (3mm to 22mm)
 •standard lengths up to 7" and metric lengths up to 180mm.
 •fractional nuts from #6 to 5/8".

Made of 1/4" thick hard very durable plastic. It's 8.75" long and 3.25" wide.

Click here to see how to use these gauges