Adjust the knob to the required size, turn clockwise to the left to lock. And it can start to cutting.Best gift for students and handicraft art lovers.2 length unit are well printed on the scale, it's even easy for kids to make handicraft. And comes with a blade storage place at the bottom to keep the accessory losing.The circular cutter is suitable for DIY pictures, cutting printing paper, photo paper, composite paper, Kraft paper, special paper, optical film, etc.quantity of delivery:1 piece(The products sold are only circular cutters, other products are not within the scope of sale)(Package contents: Only the above package contents, excluding other products.)size:220*70*35mm(Reminder: The size is measured manually, please allow 1-2 cm measurement error)color:blue colors(Due to different monitors and lighting effects, the actual color of the item may be slightly different from the color shown on the picture.)WUZHOU