This disc cutter cuts metal into perfect circles and comes in 5 different sizes: approximately 1/2inch(12mm), 5/8inch(16mm), 3/4inch(20mm), 7/8inch(22mm), and 1inch(25mm) to meet your different needs. This set of disc milling cutters is made of high quality carbon steel with fine workmanship, which effectively extends the usage time and serves you for a long time. Disc cutters can be used on up to 18 gauge soft metal sheets such as aluminum, gold, silver, copper, brass and more. When using the disc cutter, remove all punches, place the sheet metal in the slots, then place the punch ( side against the metal) in the correct slot and tap the beveled side of the punch with a mallet until it pierces the sheet metal. The disc cutter is a great set for jewelers to make perfect circles and comes in 5 sizes it can be used for a variety of metalworking projects. Colour:silver Material:steel Package Contents: 1 set x jewelry tools kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.