HSS Twist Drill 20 Piece: 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1.0, 1.2, 1.3, 1.4, 1.5, 1.6mm Replaceable Jaw Chuck Design: Easily rotate vise head to clamp the drill bit in 0.3 - 3.0mm. Precise designed chuck to keep that drill upright. Easy to hold and operate, the pin vise hand drill is user-friendly even for beginners. Its comfortable grip and manual operation offer excellent control over your work. Multipurpose DIY materials: Perfect for seashells or resin, wood, also for plastic, PVC, walnut, amber, beads, beeswax, PCB, olive nut, small model kit etc. Steady precision clamp ensures a high degree of concentricity, providing a secure and tight grip for smooth drilling operations.