Set includes: 25 - 10x24, 35 - 1/4"x20, 25 - 1/4"x28, 30 - 5/16"x18, 25 - 3/8"x16, 10 - 1/2" x 13. Organized-by-size see-thru case. Features Include: 150 quality steel lock nuts with nylon lock inserts; secure hold without lock washers!Perfect for auto, small engine, mechanical repair--anywhere secure hold is requiredAn outstanding value--like buying 25 in the hardware store and getting 125 more free!Six of the most-commonly used sizes