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Generally speaking the first Fascinating drill bit for 3 8 tap check have Insulator

3/8-16 Coarse Tap Plus Tapping and Clearance Drill Bits - Curious Inventor
3/8-16 Coarse Tap Plus Tapping and Clearance Drill Bits - Curious Inventor

DEWALT 5/16 in. Black Oxide Drill and 3/8 in. x 16 NC Steel Tap Set DWA1414  - The Home Depot
DEWALT 5/16 in. Black Oxide Drill and 3/8 in. x 16 NC Steel Tap Set DWA1414 - The Home Depot

3/8”-16 Combination HD Drill Tap - EldoradoTools
3/8”-16 Combination HD Drill Tap - EldoradoTools

High Quality 6pcs 1/8 - 3/8 Inch BSW Thread HSS Combination Drill Tap Bit  Set 1/4 Inch Hex Shank Deburr Countersink Bits - AliExpress
High Quality 6pcs 1/8 - 3/8 Inch BSW Thread HSS Combination Drill Tap Bit Set 1/4 Inch Hex Shank Deburr Countersink Bits - AliExpress

CoCocina 6pcs 1/8-3/8 Inch BSW Thread HSS Combination Drill Tap Bit Set 1/4  Inch Hex Shank Deburr Countersink Bits - Amazon.com
CoCocina 6pcs 1/8-3/8 Inch BSW Thread HSS Combination Drill Tap Bit Set 1/4 Inch Hex Shank Deburr Countersink Bits - Amazon.com

6x 1/8-3/8 Thread HSS Combination Drill Tap Bit Set With 1/4 Inch Hex Shank  - Walmart.com
6x 1/8-3/8 Thread HSS Combination Drill Tap Bit Set With 1/4 Inch Hex Shank - Walmart.com

SAE UNC UNF Threads Tap & Drill Chart Toolbox Magnet | eBay
SAE UNC UNF Threads Tap & Drill Chart Toolbox Magnet | eBay

3/8" Carbon Steel NPT Tap and 37/64" High Speed Steel Drill Bit -  Walmart.com
3/8" Carbon Steel NPT Tap and 37/64" High Speed Steel Drill Bit - Walmart.com

IRWIN 80238 - Hanson Fractional Tap and Drill Bit Set (3/8"-16 NC Tap,  Letter O Drill Bit) - Walmart.com
IRWIN 80238 - Hanson Fractional Tap and Drill Bit Set (3/8"-16 NC Tap, Letter O Drill Bit) - Walmart.com

Value Collection - Combination Drill Tap: 3/8-24, H3, High Speed Steel -  00382259 - MSC Industrial Supply
Value Collection - Combination Drill Tap: 3/8-24, H3, High Speed Steel - 00382259 - MSC Industrial Supply

6pcs 1/8-3/8 Inch Bsw Thread Hss Combination Drill Tap Bit Set 1/4 Inch Hex  Shank Deburr Countersink Bits - Tap & Die - AliExpress
6pcs 1/8-3/8 Inch Bsw Thread Hss Combination Drill Tap Bit Set 1/4 Inch Hex Shank Deburr Countersink Bits - Tap & Die - AliExpress

Drill America 3/8 in. - 16 High Speed Steel Tap and 5/16 in. Drill Bit Set  (2-Piece) POU3/8-16 - The Home Depot
Drill America 3/8 in. - 16 High Speed Steel Tap and 5/16 in. Drill Bit Set (2-Piece) POU3/8-16 - The Home Depot

Tap Drill Chart | Fastenere.com
Tap Drill Chart | Fastenere.com

Drill America 3/8 in. Carbon Steel NPT Pipe Tap and 37/64 in. High Speed  Steel Drill Bit Set (2-Piece) POU3/8NPTW/DRILL - The Home Depot
Drill America 3/8 in. Carbon Steel NPT Pipe Tap and 37/64 in. High Speed Steel Drill Bit Set (2-Piece) POU3/8NPTW/DRILL - The Home Depot

CoCud Tap and Drill Bit Set, 3/8-18 UNF 2B Tap Thread 8.1mm Drill Diameter,  Machine Screw Tap & Twist Drill Bit Tool Kit - (Applications: for Threading  Tapping Repairing), 1-Set - Amazon.com
CoCud Tap and Drill Bit Set, 3/8-18 UNF 2B Tap Thread 8.1mm Drill Diameter, Machine Screw Tap & Twist Drill Bit Tool Kit - (Applications: for Threading Tapping Repairing), 1-Set - Amazon.com

Century Drill & Tool 11 mm x 1.50 Metric Tap & 3/8 In. Brite Drill Bit  Combo Pack - Hall's Hardware and Lumber
Century Drill & Tool 11 mm x 1.50 Metric Tap & 3/8 In. Brite Drill Bit Combo Pack - Hall's Hardware and Lumber

DEWALT 3/8-in-16 2-Flute Hss Drill Tap with Drill Bit in the Taps  department at Lowes.com
DEWALT 3/8-in-16 2-Flute Hss Drill Tap with Drill Bit in the Taps department at Lowes.com

DeWALT - Combination Drill Tap: 3/8-16, 2B, 3 Flutes, High Speed Steel -  38523692 - MSC Industrial Supply
DeWALT - Combination Drill Tap: 3/8-16, 2B, 3 Flutes, High Speed Steel - 38523692 - MSC Industrial Supply

TAP + DRILL BIT 3/8-16 NC + LETTER O - Tap And Die Sets - Amazon.com
TAP + DRILL BIT 3/8-16 NC + LETTER O - Tap And Die Sets - Amazon.com

Fractional Tap & Drill Bit Set, 3/8-24 National Fine, 21/64-In., 2-Pc.  -95408 | eBay
Fractional Tap & Drill Bit Set, 3/8-24 National Fine, 21/64-In., 2-Pc. -95408 | eBay

Irwin - Tap & Drill Set: 3/8-16 Taps, O Drills - 77277754 - MSC Industrial  Supply
Irwin - Tap & Drill Set: 3/8-16 Taps, O Drills - 77277754 - MSC Industrial Supply

What size drill bit do I need to tap a 3/8 hole? - Quora
What size drill bit do I need to tap a 3/8 hole? - Quora

Saiper 6pcs Drill Tap Combination Bit Set (1/8''-3/8'') with 1/4" Hex  Shank, HSS 4341 Drill Tap Countersink Screw Thread Bits - Amazon.com
Saiper 6pcs Drill Tap Combination Bit Set (1/8''-3/8'') with 1/4" Hex Shank, HSS 4341 Drill Tap Countersink Screw Thread Bits - Amazon.com

What size drill bit do I need to tap a 3/8 hole? - Quora
What size drill bit do I need to tap a 3/8 hole? - Quora

3/8" HSS Black & Gold KFD Split Point Jobber Length Drill Bit, Killer Force Drill  Bit | KFD3/8 | DrillsandCutters.com
3/8" HSS Black & Gold KFD Split Point Jobber Length Drill Bit, Killer Force Drill Bit | KFD3/8 | DrillsandCutters.com

Drill America 3/8 in. - 16 High Speed Steel Tap and 5/16 in. Drill Bit Set  (2-Piece) POU3/8-16 - The Home Depot
Drill America 3/8 in. - 16 High Speed Steel Tap and 5/16 in. Drill Bit Set (2-Piece) POU3/8-16 - The Home Depot