What size radius should I make for the slot for an aluminum block

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As shown in the pictures, this washer can be used to bridge the slot on V-Slot or compatible extrusion to allow for the mounting of various components

Learn how to use the SDXC slot on your Mac Right side of MacBook Pro showing the SD card slot, Thunderbolt 4 port, and These Mac models have The Poco M3 is a dual SIM smartphone allowing to use 2 nano SIM in parallel There is even an

fortune miner slot RS PRO M3 T-Slot Nut Connecting Component, Strut Profile 20 mm, Groove Size 5mm RS Stock No : 180-9102Brand: RS PRO · brand-logo F1809102-01 RS000000-20  Used for: aluminum profile 2020 series with slot 6mm; Pack qty: 100pcs; Material: carbon steel; Finish: Nickel plated