LOKMAN Premium Zinc Plated Carbon Steel Rivet Nuts, Gives You a 5 Stars Reliable Smart Fasteners Home Improvement. Specification: ?Name: Rivet nut ?Material: Carbon steel, zinc plated. ?Type: Flat head, Knurled body. ?Size type: Metric size assorted in M3, M4, M5, M6, M8, M10, M12. ?Package: 175 pieces. ?More specification details: Thread--------Drill Hole Size--------Head Dia.--------Head Height--------Total Length--------Grip Range ? M3---------0.193??----------------0.315??---------------0.031??---------------0.394?? ---------------0.02??-0.06?? ? M4---------0.232?? ---------------0.354??---------------0.031??---------------0.413??----------------0.02??-0.08?? ? M5---------0.272?? ---------------0.394??---------------0.039??---------------0.512?? ----------------0.02??-0.10?? ? M6---------0.350?? ---------------0.484??--------------0.051??----------------0.610??----------------0.02??-0.12?? ? M8---------0.429??----------------0.571??--------------0.059??----------------0.728??----------------0.04??-0.14?? ? M10-------0.508??----------------0.669??--------------0.067??----------------0.846??----------------0.04??-0.16?? ? M12-------0.587??----------------0.709??--------------0.067??----------------0.984??----------------0.04??-0.16?? Package includes: M3 ------ 60pcs M4 ------ 40pcs M5 ------ 35pcs M6 ------ 20pcs M8 ------ 10pcs M10 ------ 5pcs M12 ------ 5pcs Total: 175pcs This set is organized by size/type in a transparent durable PP storage case for quick access and protection. NOTE: More choices with different sizes and qualities rivnuts are available and can be applied on LOKMAN store. Details and conditions please kindly contact us via email for more favorable discount. Thank you.