Which guide is correct for fitting a 9/16’s drill bit? The 9/16’s on this one is 43/64’s.

Good question! STI-UNC100SNP has the 9/16's marked over the biggest hole. Hope this helps. We have them in stock.

Are there 2 tap guides available one for unc & 1 for unf?

Basically it's a guide for SAE sized bolt or drill bits. The walls inside each hole are smooth. This one is not for metric. I bought this to sit on a surface that I will drill to keep my drill hole straight. It will sit on a flat surface as well sit perfectly on a corner. For example when installing a handle on a cabinet with a hole drilled in at a slant will cause the handle to not position flush to the surface when installed looking like a jank ass been slopping things up in there...

Why are the guide holes so much larger than nominal? nominal=>measurements: 1/2=>.608, 7/16=>.532, 3/8=>.458, 5/16=>.391, 1/4=.318

Can I use a tap guide as a drill guide? No, the tap guide is sized for tap diameters. The drill guide is sized for drill bits. There is a difference and if you attempt to use the tap guide as a drill guide there will be slop and inaccuracy.

Material	Nickel Alloy Steel
Finish Type	Nickel
Shank Type	Round
Brand	Big Gator Tools
Item dimensions L x W x H	4.75 x 1.13 x 0.88 inches
Tool Flute Type	Straight
Point Style	Guide Point
Surface Recommendation	Steel
UPC	613103042718
Unit Count	1.00 Count
Global Trade Identification Number	00613103042718
Manufacturer	Big Gator Tools
Item Weight	8 ounces
Product Dimensions	4.75 x 1.13 x 0.88 inches
Item model number	BGRSTIUNC100SNP
Is Discontinued By Manufacturer	No
Manufacturer Part Number	BGRSTIUNC100SNP

STI-UNC V-TapGuide

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