Gold Test Needles Set of Five-10K-12K-14K-18K-& 22K Prop 65 - Lead-Phthalates The set includes a punch

The set includes a punch handle and is presented in a hinged wood storage box

Grobet Swiss Pattern Precision Files are manufactured in Italy

Note: Jeweler's taps and dies feature broader threads than watchmaker or machinist taps and dies

Valtitan files are especially recommended for platinum and other hard metals such as stainless steel

Gold Test Needles Set of Five-10K-12K-14K-18K-& 22K Prop 65 - Lead-Phthalates The set includes a punchGold Test Needles Set of Five (10K, 12K, 14K, 18K & 22K) This professional set of gold test needles includes five needles, each tipped with a different karat of gold, allowing jewelers and metalsmiths to perform comparative acid testing across the most common gold purities. By rubbing each needle against a test stone alongside an unknown gold item, then applying testing acid to both marks, you can observe and compare the acid reactions to estimate the