Jeweler's Small 3-1/2" Push Drill for Micro Bits 0.20mm to 1.0mm Classic jeweler's tool for use with micro-sized drill bits or other accessories Chuck rotates as spindle nut is depressed, spring automatically 'rewinds' to top Permanent adjustable collet accepts bits from 0.20mm to 1.0mm Brass construction with bright nickel finish; free-spinning finger grip at chuck Use for jewelry & watch fabrication & repair, electronics, circuit boards; 3-1/2" length, 0.7 oz