4 New Silver Test Acids Test Stone and Files4 Bottles of Silver Test Acid This is a new set of 4 1/2 fl oz bottles of Silver testing acid These are the finest acids made today Sturdy plastic bottles maximize safety and allow the user to easily squeeze out a drop at a time Due to testing acid being classified as a hazardous material it cannot be shipped by air and can only be shipped to the lower 48 states.Acid Test Stone Arkansas test stones for acid testing of silver, gold, and platinum A dark stone on which needle and item to be tested are rubbed Use this with test acid solutions It measures approximately 1 15/16" x 1 15/16" x 1/4" 10 Pc Needle File Set This is a new set of 10 needle files These are for filing all kinds of materials including platinum, stainless steel, exotic plastics and other hard to find materials Better performance on hard to file surfaces Little or no clogging, a simple knock is enough to remove the chips Highly resistant to corrosion and longer life than standard files Each measures approximately 5 3/8"