The set made from tough chrome vanadium steel and plastic is rust free,hence strong and durable. The screwdriver kit has fastening/tightening applications and is broadly been used by electricians,construction workers,mechanics,etc. The forged steel bits of the screwdrivers are heat treated for additional strength. The green plastic grip is designed ergonomically to prevent slipping of the tool while using it. The kit includes various sizes of screwdrivers as follows: ,screw driver number : 824,p5-861-75,p6-862-100,913,925,935,814 ,moreover,the tool kit comes with a glossy blister packing which helps to identify each tool without even unboxing it.