after assembling needed drills into the corresponding hand drills, make sure the power is connected and turn on the switch to begin electric hand drill, or just take up pin vise hand drill to use, drill holes where you want on resin crafts, these well made hand drills can help to create precise holes, facilitate to make delicate pendants drill pins are made of high-speed steel, and sturdy for long lasting use, electric hand drill and pin vise hand drill are compatible with different materials, can be applied with resin, wood, plastic, polymer clay, beads, pearl and other surfaces, our hand drills are not suitable for hard surfaces such as stone and sturdy metal surfaces electric hand drill tools are practical for resin jewelry crafts making, after you finish your jewelry resin crafts creating, you can use hand drill to drill a small hole on your jewelry craft, which makes it convenient to attach on chains to make necklace, earring, bracelet, pendant we have 2 different hand drill kits , electric hand drill and pin vise hand drill, electric style and manual style to apply according to realistic need, bring you a smooth using process; When using electric style, please make sure the USB is plugged into the plug, not the computer, to keep electric hand drill with enough speed Package details: you receive 1 piece electric hand drill, 8 pieces drill bits, 1 piece pin vise hand drill, 10 pieces mini drills, 10 pieces PCB twist drills and 1 piece screwdriver, drill bits have 4 different sizes, . 0.8-1.2 mm, mini drills have 10 different sizes, are . 0.8-3.0 mm, and twist drills are . 0.3-1.2 mm, Manufacturer: Ounfhtrttk