WHITEMOON 2-in-1 Cup Edging Tool, Cup Edger Cutting for Custom Tumblers, Tool for Drawing Level Line of Split Tumbler Cups (Teal) by Best Art Supplies ★★★★★ $12.97 Buy Now amazon.com Description No longer frustrated by the uneven tape- Adjust the blade to the height you need, place the taped cup on the base close to the blade, grip the tool by hand, and rotate the cup smoothly with the other hand to start cutting Mark or draw line on split tumblers- The height of the pen clip is adjustable, you can easily draw level lines on the cup to make a wonderful split tumbler Can grip edging cutter well with your hand- It has 2 concave design at the back, which can fit your fingers well and allow you to control it with one hand without affecting the work of your other hand Perfect for a variety of tumblers- The frosted surface of the base does not cause the cup to lose control, it works well whether you put a 10 oz cup or a 40 oz cup No Assembly Required- It can be used out of the box without assembly and comes with a blade User reviews ★★★★★ Used it for the 1st time on my fabric cup... PERECT. It also has a tool to add in ur pencil or marker to get a straight line around your tumbler. Works great. ★☆☆☆☆ Box had obviously been opened before. Was sent with no pen holder. ★★★★★ Love it for tumblers. View all reviews