Stainless steel set screws with hexagon recessed heads. Ends have cup points for positive torque. Handy kit for shop toolroom or toolbox. On hand when needed saves time and money. Plastic compartment box is easy to store. The Precision Brand 220-piece stainless steel set screw Assortment contains: (5) 4-40 x 3/16 in, (10) 6-32 x 3/16 in, (5) 6-32 x 1/4 in, (10) 8-32 x 3/16 in, (5) 8-32 x 1/4 in, (10) 10-24 x 1/4 in, (5) 10-32 x 1/4 in, (5) 10-32 x 3/8 in, (25) 1/4-20 x 1/4 in, (20) 1/4-20 x 3/8 in, (5) 1/4-20 x 1/2 in, (20) 1/4-28 x 1/4 in, (25) 5/16-18 x 3/8 in, (20) 5/16-18 x 1/2 in, (20) 5/16-24 x 3/8 in, (10) 3/8-16 x 3/8 in, (10) 3/8-16 x 1/2 in and (10) 3/8-24 x 3/8 in.