High Concentricity: aligned bits and spindle ensures not torques loss for more efficient operate with less effort Durability Construction: metal build excellent shock resistance and longevity for various working conditions Wide Compatibility: 6.35mm hexagonal shank design fits most manual and power tools on market for versatile applications Spring Mechanism: Equipped with spring loaded structure for easy handed bit changes simply press to eject bits instantly Strong Design: Features powerful rings to securely hold screws in place, drops and improving work efficiency, Manufacturer: KACCDE