Features:Manufactured from heat treated Chrome Molybdenum steel.Square section aids removal of extractor from screws.Supplied in storage tray.Specifications:Model No: AK719Contents: #1; 1/8"(3mm), #2; 3/16"(5mm), #3;15/64"(6mm), #4; 5/16"(8mm), #5; 3/8"(9mm)Height: 183Width: 118Length: 12.