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 8-3/4" long and 3-1/4" wide.
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