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S-0616-1ZI Penn Engineering Self-Clinching Pem Nuts, Types S, Thread Size.375-16 (3/8-16), Thread Code 0616, Hole Size in Sheet .500 in, Heat Treated Carbon Steel, Zinc Plated Finish, (Quantity 100)Amazon$46.91
HFH-0616-12ZI Penn Engineering PEM Self Clinching High Strength Studs-Type HFH, Thread Size .375-16 (3/8-16), For Hole Size .375 inches,Heat Treated Carbon Steel, Zinc Plated Colorless, (Quantity 100)Amazon$10.89
CLS-0420-2 Penn Engineering SELF-CLINCHING PEM NUT, Thread Size .250-20 (1/4-20), (Quantity 10) Fastener Material: 300 Series Stainless Steel, Passivated Finish, Hole Size in Sheet .344 inchesAmazon