One-key positioning reduces the time of drawing lines to find positions. Porous measurement is accurate and widely used. The fixed nut is flexible and can be adjusted 360 degrees freely to prevent mistakes and improve work efficiency. Made of high quality stainless steel, durable and practical. Used for precise positioning of drilling holes for ceramics, marble, wood, and plastics. Name: Universal Positioning Hole Opener Specification: 40cm Thickness: 1mm Material: Stainless Steel Color: Silver Package Contents: 1 x Universal Positioning Hole Opener Note: Light reflection and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement allowed error is +/- 1-3cm.