COMPLETE 40-PIECE SET HARDWARE KIT - Includes 40 Pieces of 1/4-20 carbon steel rivet nuts, 40 Pieces of 1 button head socket cap screws, and 40 Pieces of flat washers for versatile fastening applications PREMIUM STEEL CONSTRUCTION - Corrosion-resistant carbon steel and stainless steel ensures long-lasting performance in indoor and outdoor applications, won't rust or corrode over time VERSATILE THREADED INSERT SOLUTION - Perfect for automotive repairs, furniture assembly, metal fabrication, electronics mounting, and DIY projects requiring strong threaded connections in thin material EASY INSTALLATION WITH STANDARD TOOLS - Compatible with standard rivet nut tools and hand riveters; creates strong, permanent threads in sheet metal, plastic, fiberglass, and composite materials 1/4-20 rivet nuts grip range:0.020 -0.120 (0.5-3mm); body diameter:0.350 (8.9mm), application drill hole size:0.351 -0.356 . (9mm); head height: 0.055 (1.4mm); head diameter: 0.490 (12.4mm) 1/4-20 x 1 Bolts Head Diameter: 0.432 ; Head Height: 0.13 ; Drive Type: Allen Hex Socket 5/32 is needed. ASIN B0GYW432PM Brand Woopais Set Name 1/4-20 Rivet Nut And Bolt Set Size Name 1 Bolts Unit Count 1 Count Item Weight 8 ounces Part Number CARBON1/4-R-B-1 Thread Size 1/4-20 Thread Type Unified National Coarse Manufacturer Woopais Thread Class UNC Fastener Type Rivet Nut And Bolt Item Diameter 0.35 inches Material Type Carbon Steel, Stainless Steel Item Highlight Carbon Steel Zinc Plated Knurled Rivnut, Stainless Steel Screws, Blind Fastener Nutsert for Automotive Sheet Metal Exterior Finish Stainless Steel and Zinc Item Dimensions 3 x 2 x 0.75 inches Number Of Items 120 Number of Pieces 40 Outside Diameter 0.35 inches Screw Head Style Button Inside Thread Size 1/4-20