Features: 1. Made of high quality material 2. Closed bearing, make opening more convenient, not easy to slip. 3. Super large positioning screw and thickened rubber sucker make the positioner connect with the ceramic tile, and the opening does not slip. 4. Application, it can be used for positioning holes in glass, ceramic tile, marble and ceramics. Specification: Material: engineering plastic A: The length is 165mm/6.49'', the width is 140mm/5.51'', and the clamping range is 4-83mm/0.15-3.26'' B: The length is 280mm/11.02'', the width is 200mm/7.87'', and the clamping range is 4-83mm/0.15-3.26'' Use Steps: 1. Mark the hole to be punched. 2. Put the drill bit into the limit hole for positioning, and press down the locking position of the sucker handle. 3. Tighten the fixed position of the positioning shaft and stabilize the positioner. 4. Start the drill to open the hole. Note: water must be added during drilling. Good cooling can prolong the service life of the drill bit. 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! 2. Please allow 1-2cm measuring deviation due to manual measurement.