I cant figure out how to find the size I need. What is the size 10 mean on the nut sizer part? I need to find a tap for a size 10 hole. Thanks

Howdy Michael. The 10 corresponds to a number 10 machine screw. According to the Standard US Machine Screw Sizes, a number 10 comes in two thread sizes: a 10-32 and a 10-24. The 32 and 24 refer to the number of threads per inch. So, if you've used the gauge and determined you have a #10 screw, you'll then need to decide if you need the "fine" thread, 32 or the "coarse" thread, 24. Your local hardware store could help you determine which you need and what tap size you'll need.

Is it both SAE and Metric?

Yes it is both metric and SAE. On the backside it also has United States Thread Pitch and Metric Thread Pitch. Both Inch and mm bolt length are on longer sides. Bolt dia. goes from 3 to 22 metric and 1" to 1/4" SAE. The shoulder posts for nuts is more limited but has both metric and SAE.

what is the smallest and largest sizes?

SAE screw = 1 inch to #4 Metric screw = 22mm to 3mm SAE nut = 5/8 inch (no gauge for metric nuts) Screw metric pitch from 0.70mm to 2.00mm Screw SAE pitch from 10TPI to 24TPI

ASIN	B001FZOCCG
Batteries Required?	No
Batteries included?	No
Colour	BLUE
Customer Reviews	4.6 4.6 out of 5 stars (17)
Date First Available	7 Aug. 2012
Item Package Quantity	1
Item Weight	45.4 g
Item model number	BOLT SIZE IT BLUE
Manufacturer	Boltsize-It
Material	Plastic
Measurement System	Metric
Part number	BOLT SIZE IT BLUE
Product Dimensions	15.24 x 7.62 x 1.27 cm; 45.36 g
Style	T Square

Gauge, Blue

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