These are Du-Bro's "Permanent Mount" Blind Nuts.

FEATURES
Zinc plated, metal construction.
Ideal for mounting engines, landing gear, cowls, hatches, etc.
The perfect mounting nut for hard to reach areas.

Dubro Blind Nuts 6-32 (4)$29.00
Dubro Blind Nuts 2-56 (4)$29.00
Dubro Blind Nuts 8-32 (4)$30.00
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Dubro Blind Nuts Bulk 6-32 (24)$119.00
Dubro Blind Nuts Bulk 4-40 (24)$119.00