Electric drills make holes in a fraction of a second. But i generally prefer to use manual methods for better verification and authenticity - for example, hole punches for steel and mechanical drills for jewelry made of ion-exchange resins and plastics. In the available review of tools, i will compare the operation of a simple manual drill and a spiral raschet (spring) drill on similar polymers, such as epoxy resin and glue. I purchased a cheap hand drill from a local craft store. Small windows sent me a spiral rasher drill for testing. They have both had bits polymer clay ideas to form the hole sizes that we sometimes need to insert a jump ring. The bits were inserted into the drill holes, only the collet shell was relatively unscrewed. Then the collet was tightened with his own hands. The manual electric drill did have 2 bits, but the small one was useless. It remained as if cheaply made, which the child tsang could not hold a small scrap of. There were 3 different bits for the spiral rasher drill-i checked its maximum bit as it was nicer only in size to the manual one. This is the easiest way to do it. Flow up and down. Both drills did their business with my snowflake resin jewelry when there was epoxy resin, unpolished shrink-dink, and resin tape layers. It became more difficult to go with finished shrinks with a hand drill (not described), polymer clay decor most of it was due to the fact that the upper part of the drill bit pressed uncomfortably on my hand. The holes are optimally prepared with a paper punch with someone else's hole before shrinking! The polymer material was easily amenable to both drills. The thick piece of plastic that i used was a test sample from helen braile, a plastic craftsman and citizen of grand river beads. The distinction, as well as, when with pieces of resin, consists in the time it takes to process. I would certainly recommend a spiral raschet electric drill when you are very much using the services of polymers and resins. This simplifies the task. Then as much as the bits were different for this purpose of a particular spiral drill with a rasher, taking slightly larger drills may include significance if you wish to double the jump rings for privacy purposes.