Description: - Unique patented locking function, breaking the traditional locking methods. - After having ratchet, the locking pieces mounted rear sleeve, the locking peripheral length, more effective in prevent the removal work loose, the collet reliable when the gripping means. - texture, comfortable coat surface. - Torque thrust bearing unique exerted translate into greater clamping force. - Suitable clamping range 0.810mm.Specification: - Material: Steel - Color: BlackSize Chart:5cm x 4cm/1.97inch x 1.57inchPackage Includes:1 Piece Keyless Drill Chuck ConverterNote:1. Please allow slightly error due to manual measurement.2. Due to between different monitors, the picture may not reflect the actual the item.3 shopping!