Measures fractional bolts from size #4 to 1" up to 7" long
Measures metric bolts & screws from size 3mm to 22mm
Made of very durable 1/4" thick hard plastic
1/4" thick x 8-3/4" Long x 3-3/8 Wide Color: Yellow
This is a must have tool for anyone who uses bolts, screws or nuts. It easily measures diameter, thread pitch and length of most nuts, bolts and screws. Every gauge is the same, just different colors.