HIGH QUALITY: This adjustable hobby drill has 3 jaw hardened steel keyless chucks to grip the small drill bits tightly. After many uses the drill bit does not skid and not falling off. And can adjust twist drills with a diameter of 0.2 - 3.4mm AND USEFUL: The hand drill pin can hold small drills; deburrers; wires; reamers is useful for electronic assembling; tool making; making. WIDE APPLICATION: The small hand drill can be applied to the wood; jewelry; PVC; walnut; amber; beeswax; olive nut; acrylic and plastic etc. NOTE: The adjustable pin is a manual tool not a tool; Twist drill bits set can't fit to hard things like steel; iron; stone. Compact size manual hand drill is good to store in a toolbox or in pocket. A manual pin vice may be used of a drill for very exact drilling. Despite using a slower drill speed, it can still be difficult to get as precise with a drill as when using a pin vice. This is important in order to tasks such as watch repair where any slip or knock could damage other components in the device. Chuck clamping range: 0.5 - 3.4 mm Twist drill bits material: high speed steel Drill specifications:0.5/ 0.6/ 0.7/ 0.8/ 0.9/ 1.0/ 1.2/ 1.4/ 1.6/ 1.8/ 2.0/ 2.3/ 2.5/ 2.8/ 3.0mm Material: alloy Length: 95 mm/ 3.74 inch Color: silver & black Package Contents: 1 * Hand drill 30 * Twist drill bits Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.