Velleman vthd01 electric precision drill and grinder set 12v 12 000rpm velleman vthd01 a direct drive 12v precision drill with a single fixed speed of 12 000rpm ideal for drilling pcbs engraving and precision grinding the drill is supplied in a set including two grinding stones 2 engraving bits and 2 collets velleman vthd01 electric precision drill grinder 12v 12000rpm