Low car diet
Join Date: Aug 2007
Location: Corvallis, OR, USA
Posts: 2,407
Bikes: 2006 Windsor Dover w/105, 2007 GT Avalanche w/XT, 1995 Trek 820 setup for touring, 201? Yeah single-speed folder, 199? Huffy tandem.
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That's the Torx pattern. Your multi-tool likely has a T25 size, which fits the common bolts on disc brake rotors.
These rotor bolts have M5 threading ("M" sizes designate both thread pitch and diameter), which is a common bolt threading that can be used on many places on the bike, such as water bottle mounts.
The bike shop should have disc rotor bolts, but they're not very long. The hardware store might have longer M5s, and various diameters and pitches of bolts with a T25 head.