Shaviv 153-29005 F Blade Holder has an external thread M7 to receive all “F” countersink blades.
Micro Finishing, Shaviv Deburring Tools by Vargus
Compare
Shaviv 153-29005 F Blade Holder
Shaviv 153-29005 F Blade Holder
$8.99
Shaviv 151-29023 High Speed Steel Blade B-30 



