The arbor of the trim saw attachment is 15 mm.
From the manual:
Your circular saw is designed for use with 3-3/8 inch (86 mm) diameter blades that have a 15 mm diameter bore. Blades must be rated for 3000 RPM operation (or higher).
NOTE: This saw is designed to cut wood and plastic. Do not use masonry or metal cutting blades. DO NOT use any abrasive wheels.
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