Professional tool for commercial or occasional use. Manufactured from chrome vanadium steel for strength and durability. Coated for rust and corrosion resistance. Set Includes;: 1.6mm x 30pc 3.2mm x 30pc 4.8mm x 40pc 6.4mm x 50pc 9.5mm x 50pc 12.7mm x 40pc 15.9mm x 20pc 19.1mm x 20pc 22.2mm 20pc Comes in a plastic reseal able case for easy storage and transportation.