Can anyone suggest a drill/ tap that would work with these?

I use either a 6mm or 1/4" drill bit

Will these work with pre-wired 3mm leds?

These LED lamp holders cannot work with the pre-wired leds, because there is a black plug in each holder to hold the lamp, and the holes are not large enough for pre-wired lamps to stick in. The video will show you how to install the lamps, maybe it will help you understand how these LED holders work with LED lamps.

Brand	DAIERTEK
Material	Copper
Color	Silver
Product Dimensions	0.12"W x 0.59"H
Mounting Type	Protruding
UPC	016071637014
Manufacturer	DaierTek
Item Weight	0.064 ounces
Country of Origin	China
Item model number	MLH-3-2
Pattern	MLH-3-2
Shape	Circular
Installation Method	Screw-In
Item Package Quantity	20
Handle Material	Metal
Batteries Included?	No
Batteries Required?	No

DaierTek 20pcs 3MM Diode LED Light Holder Chrome Brass Prominent Bezel 6mm Dia. Screw Panel Mount

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