For proper mounting of lasers on batter boards and forms. Instrument holder with flexible guide rail allows quick positioning and precise alignment of the device. Can be rotated through 360° and adjusted by 2.5in. Versatile use: 1. Central positioning of the instrument on the batter board holder, 2. Off-center positioning using the rotary plate and guide rail. Removable rotary plate for quick and simple attachment of the device. Robust construction – holder, rotary plate and guide rail all in metal. Stable attachment of the batter board holder with four screws – on batter boards with a thickness of up to 3.25in. 5/8-11 threaded screw as standard connection for rotation laser and theodolites.