This tool is made of high manganese wear resistant steel. This is a must-have bike repair kit. It has 6-piece hex keys, 1-piece slotted screwdriver, 1-piece cross head screwdriver, adaptor wrenches (8mm, 10mm, and 15mm), and 3-piece socket (8mm, 9mm, and 10mm). 3 1/2" L x 1" W x 1 3/4" H