characteristic: Includes 2 rulers and 1 set (4 pieces) of circular knife dies with different specifications, which is convenient to do DIY by hand. A, B two-sided design, A side: a circle composed of waves as shown in the figure, used for setting. B side: a slightly smaller circle, used for clamping the snap button surface. Recommended leather thickness: 0.3-0.5mm Specification of circular die: 10/13/15/17mm The ruler is made of high quality acrylic, and the circular knife die is made of steel, which is durable. Our diy handmade leather bag snap button installation tool kit makes snap button bag with your favorite leather material more unique. describe Name: DIY handmade leather bag snap button installation tool kit Material: Steel+Acrylic colour: Black+transparent Package Contents: 1 x Handmade leather tool set 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.