Gold Test Needles-Set Of Four-10K-14K-18K & .999 Silver Bands & Mountings shielded ball bearings Drive Type

shielded ball bearings Drive Type Square drive (H-type only) Chuck Key Included

193 are sold separately

30mm FTC118

000 rpm Collet Size (465 HP) 3/32" (2

Gold Test Needles-Set Of Four-10K-14K-18K & .999 Silver Bands & Mountings shielded ball bearings Drive TypeGold test needles are an essential tool for jewelers performing acid based metal testing. This set of four needles covers three gold karats 10K, 14K, and 18K plus . 999 fine silver, giving you a reliable reference for the most commonly tested metal finenesses. To use, select the appropriate karat needle and rub or scratch it against a test stone. Make a corresponding scratch or rubbing with the item being tested alongside the needle mark. Apply a drop