Fangrui Product Details Thread Size:(female)m2 Product Name:nylon Lock Nuts Material:zinc Plated Weight:13g Main Color:silver Hex Head, Female Threaded Inside, Metal Material, Anti-loose Hex Nut. Used With A Machine Or Cap Screw For Mechanically Joining Materials Together. Used Widely For Matching Screws Or Bolts. Made Of Metal Material, Full Threaded Rod. The Most Economical And Most Common Form Of Threaded Rod. Typically Used By The Plumbing And Contracting Trades. Used In Maintenance Departments In Various Applications. Height:3mm/0.12 Inch Width Across Flats:4mm/0.16 Inch Width Across Corners:4.3mm/0.17 Inch Package Content:50 X Nylon Lock Nuts Note: Light Shooting And Different Displays May Cause The Color Of The Item In The Picture A Little Different From The Real Thing. The Measurement Allowed Error Is +/- 1-3cm.