Features 1、Steady precision clamp, high degree of concentricity, closing tight, solid and easy to smooth. 2、Semi-automatic hand drill thickening nut, strong and not easy to crack. 3、It is precise, accurate and efficient and tightly holds bit, can clip 0.8-3.0mm drill bits. 4、Screw and half mechanical design, positioning accuracy, save time and effort. 5、Can be used for wood, plastic, rubber, soft metal punching, bodhi, bone, etc Specification Features: Steady precision clamp, high degree of concentricity, closing tight, solid and easy to smooth. Semi-automatic hand drill thickening nut, strong and not easy to crack. It is precise, accurate and efficient and tightly holds bit, can clip 0.8-3.0mm drill bits. Screw and half mechanical design, positioning accuracy, save time and effort. Can be used for wood, plastic, rubber, soft metal punching, bodhi, bone, etc. Specification: Material: Brass Weight: 63g/2.2oz Color: Silver Length: 12.1cm/4.8inch Chuck Size: 1.2 - 2.2mm Bits Specification: 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm Package List: 1 x Drill 20 x Drill Bits Package List