Steel: Steel, wear-resistant and corrosion-resistant, with long service life Slotted head design: Meet the tightening requirements of different type of screws and is multifunctional design: adsorption screw, which is for and prevents the screw from falling Nonslip grip: Humanized grip design, nonslip grip, more comfortable and stable Precisions technology: Strong cutting power, suitable for screws of various size, Manufacturer: Kelisdi