What are the recommended nuts for the t-slot of the QCW frames?

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the dog house slot png T-Slot Fastener Screw Fixture Item No : GC24011901 Undersized to fit machine table slot case hardened images 5pcs T-Track Knob Kit Item No : GC23102602

tracker slot Features: 1 Perfect woodworking new type T slot track, it's a very convenient and useful tool 2 Made of aluminium alloy, durable and easy to use