Does this hold completely round drill bit shafts?

NO. It’s a magnetic chuck for holding HEX head sheet metal screws. 1/4” & 5/16” across the flats. Sorry. 🇺🇸

Is the 1/4 end tapered or flat like the 5/16 side

It's tapered down for the 1/4" side.

How does this piece hold up with a impact drill?

If the impact is too powerful, sometimes the magnet breaks. But the bits 1/4 and 5/16 holds pretty good. I don’t use this bit for 3”-4” self tapping screws 5/16hex, I only use this for service calls and opening panels for hvac.

Brand	Malco
Item Length	4 Inches
Material	Alloy Steel
Finish Type	Finished
Number of Pieces	1
UPC	686046549675
Global Trade Identification Number	00686046549675
Manufacturer	MALCO PRODUCTS
Part Number	MSHMLC
Item Weight	0.01 ounces
Item model number	MSHMLC
Is Discontinued By Manufacturer	No
Size	4 In
Color	Multi
Style	Hex Driver
Finish	Finished
Pattern	Tool Chuck
Power Source	Hand Powered
Item Package Quantity	1
Head Style	Hex
Cutting Diameter	0.25 Inches
Measurement System	Inch
Compatible Fastener Range	0.25 inches
Special Features	Cleanable, Reversible
Included Components	1 Hex Driver
Batteries Included?	No
Batteries Required?	No
Warranty Description	1 year manufacturer defect
Assembled Diameter	0.25 Inches

MalcoMSHMLC 4-inch Cleanable Reversible 1/4-inch and 5/16-inch Hex Driver (1-Pack)

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