Fixed Laser Mounting Stand to attach any of the 105X laser diode modules to your desk, robot, shark, etc. Dimensions: 35mm x 30mm x 18mm, Mounting hole diameter: 3.5mm / 0.14", Mounting hole pattern: Square 14.8mm (along, the length) x 23.8mm (along the width). Fits lasers with up to 12.5mm diameter (0.5"), Weight: 22 grams.