Rannb 30cm/ 11.8" Adjustable Compasses Type Glass Circle Circular Cutter with Suction Cup

6 Numbered Tungsten Carbide Wheels Design Glass Cutter Package Content: 1 x Glass Circular Cutter Color: Black, Gold Tone Note: No oil feed! Usage: 1. Remove the glass out off the frame and place it on a soft smooth surface. 2. Cut a exact circle, knock along the cutting line on the flipside of the glass until it crack. 3. Cut several small squares on the glass will help galss cracking. 4. Break down the small squares slowly.