Specification: Type of screw head: Y shape Screw head size: 3 / 4 / 5 / 6mm Material: chrome vanadium steel Bit material: CR-V Handle material: TPR Total length: approx.130mm/5.11'' Features: 1. Made of TPR material, non-slip grip, ergonomic design, manual tool screwdriver handle is based on ergonomic design, making the work feel comfortable and convenient. 2. The Bit made of chrome vanadium alloy steel, hardness treatment,the use of strong torque on the use.