For the R/C enthusiast and builder! Beef up your tool box with our "Big Bag," hex head hardware kit. 650 pieces of stainless steel M3 cap screws, flat washers, and nylon lock nuts. Includes 50 each of the following sizes: 6mm, 8mm, 12mm, 14mm, 16mm, 20mm, 25mm, and 30mm. You also get 100 flat washers with 150 nylon lock nuts.