what size drill bit and tap do I use with these.?

this is machine screws no need to drill holes for installation. commonly ph2 bit fit to screw-in it.

What is the diameter of the head? Thanks

diameter of head is 7mm(approximately 5/16").

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🔧 Elevate your DIY game with the ultimate M4 fastening kit!

VERSATILE SIZE RANGE - Six screw lengths from 6mm to 20mm to fit thick and thin materials
SLEEK FLAT HEAD DESIGN - Countersunk flat heads ensure flush, professional finishes
PRECISION PITCH DRIVE - 0.7mm thread pitch with Phillips drive for secure, easy fastening
ROBUST CARBON STEEL BUILD - Grade 4.8 strength for lasting durability and reliability
COMPLETE M 4 FASTENING SOLUTION - 220-piece kit with screws & hex nuts for every project

The binifiMux 220pcs M4 Flat Head Black Screw Nuts Kit offers a comprehensive assortment of high-quality carbon steel screws and hex nuts. Featuring a precise 0.7mm thread pitch and Phillips drive, these countersunk flat head screws provide a flush finish ideal for professional and home projects. With six versatile screw lengths ranging from 6mm to 20mm and a robust Grade 4.8 rating, this kit ensures durable, reliable fastening for a wide range of applications.

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Head Style	Flat
Finish Type	Black
Thread Size	M4-0.7
Number of Pieces	220
Grade Rating	Grade 4.8
Manufacturer	binifiMux
UPC	680727734893
Special Feature	assortment kit, with hex nuts
Item Weight	222 g
Package Dimensions	13 x 6.5 x 1.9 cm; 222 g
Item part number	CF-504
Included Components	screws, hex nuts
Are batteries included?	No

binifiMux 220pcs M4 Flat Head Black Screw Nuts Kit, M4 x 6mm/ 10mm/ 12mm/ 16mm/ 18mm/ 20mm

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