The ring mandrel sizer is made of aluminium material, US UK standard, easy to read size chart on mandrel for full and half sizes; 27 pieces ring sizer set made of steel,US size(0-13),come in half sizes, come with a flexible cable with a screw connection which can be opened easily Ring sizer measuring tool kit with metal ring mandrel help you easily get accurate ring size of yourself ,your lover, families, and friends. steel ring mandrel and jewelry mallet is good shaper tool to fix bent rings Ring measurer and ring sizer has been helpful when ordering rings online. kit contained ring mandrel could measure ring size easily.Finger ring sizers that you can slide right on your fingers to determine size. Solid conical ring sizer mandrel can be hammerable,can withstand beating,for ring measurement and ring repair Essential Jewelry size measuring tools kit for professional and beginner, designed for wire working,, wire wrapping and wire jewelry, easy to use Ideal measurement tools can help you easily get the exact size of your lover, these jewelry making tools can be widely applied for , wire working and jewelry, convenient to operate for any DIY lovers or beginner Color: As shown Material: Metal Package Contents: 1*set mandrels for jewelry making 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.