Features: Made of high quality 304 stainless steel, rust and corrosion resistant, widely used in industry This set is organized by size in a transparent storage case for quick access and protection. There are 6 different sizes in one set to meet your various needs. Ideal for use by a variety of workers and repairmen from plumbers to assemblymen both professional and amateur, even DIYers can opt to use it. Similar to countersunk head screws, the nail head is embedded in the machine parts. Generally used in various machine tools and accessories Specification: Material: 304 stainless steel Weight: Approx.556g/19.6oz Size: 1/4-20*1/2 10pcs 1/4-20*5/8 10pcs 1/4-20*3/4 10pcs 1/4-20*1 10pcs 1/4-20*1-1/8 10pcs 1/4-20*1-1/4 10pcs 1/4-20*nut 30pcs Package list: 1/4-20*1/2 10pcs 1/4-20*5/8 10pcs 1/4-20*3/4 10pcs 1/4-20*1 10pcs 1/4-20*1-1/8 10pcs 1/4-20*1-1/4 10pcs 1/4-20*nut 30pcs