characteristic: 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. describe Name: universal positioning hole opener Specification: 40cm Thickness: 1mm Material: Stainless steel colour: silver Package Contents: 1 x Universal positioning hole opener 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.